Put a +1/+1 counter on target creature you control if it's legendary. Then it fights target creature an opponent controls. (Each deals damage equal to its power to the other.)
{2}
Arcane Signet
Artifact
{T}: Add one mana of any color in your commander's color identity.
{1}{G}{W}
Armadillo Cloak
Enchantment - Aura
Enchant creature
Enchanted creature gets +2/+2 and has trample.
Whenever enchanted creature deals damage, you gain that much life.
{4}{W}{W}
Austere Command
Sorcery
Choose two --
• Destroy all artifacts.
• Destroy all enchantments.
• Destroy all creatures with mana value 3 or less.
• Destroy all creatures with mana value 4 or greater.
--
Battlefield Forge
Land
{T}: Add {C}.
{T}: Add {R} or {W}. Battlefield Forge deals 1 damage to you.
{2}
Blackblade Reforged
Legendary Artifact - Equipment
Equipped creature gets +1/+1 for each land you control.
Equip legendary creature {3}
Equip {7}
{8}{R}
Blasphemous Act
Sorcery
This spell costs {1} less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.
{1}{R}
Blazing Sunsteel
Artifact - Equipment
Equipped creature gets +1/+0 for each opponent you have.
Whenever equipped creature is dealt damage, it deals that much damage to any target.
Equip {4}
{R}{W}
Boros Charm
Instant
Choose one --
• Boros Charm deals 4 damage to target player or planeswalker.
• Permanents you control gain indestructible until end of turn.
• Target creature gains double strike until end of turn.
--
Boros Garrison
Land
Boros Garrison enters the battlefield tapped.
When Boros Garrison enters the battlefield, return a land you control to its owner's hand.
{T}: Add {R}{W}.
--
Boros Guildgate
Land - Gate
Boros Guildgate enters the battlefield tapped.
{T}: Add {R} or {W}.
{R/W}{R/W}{R/W}
Boros Reckoner
Creature - Minotaur Wizard
Whenever Boros Reckoner is dealt damage, it deals that much damage to any target.
{R/W}: Boros Reckoner gains first strike until end of turn.
3 /
3
{2}
Boros Signet
Artifact
{1}, {T}: Add {R}{W}.
--
Brushland
Land
{T}: Add {C}.
{T}: Add {G} or {W}. Brushland deals 1 damage to you.
--
Command Tower
Land
{T}: Add one mana of any color in your commander's color identity.
{2}{G}{G}
Court of Bounty
Enchantment
When Court of Bounty enters the battlefield, you become the monarch.
At the beginning of your upkeep, you may put a land card from your hand onto the battlefield. If you're the monarch, instead you may put a creature or land card from your hand onto the battlefield.
{2}{W}{W}
Court of Grace
Enchantment
When Court of Grace enters the battlefield, you become the monarch.
At the beginning of your upkeep, create a 1/1 white Spirit creature token with flying. If you're the monarch, create a 4/4 white Angel creature token with flying instead.
{3}{R}
Crimson Fleet Commodore
Creature - Ogre Pirate
Trample
When Crimson Fleet Commodore enters the battlefield, you become the monarch.
5 /
2
{5}{G}{G}
Dawnglade Regent
Creature - Elk
When Dawnglade Regent enters the battlefield, you become the monarch.
As long as you're the monarch, permanents you control have hexproof.
8 /
8
{1}{R}
Dockside Extortionist
Creature - Goblin Pirate
When Dockside Extortionist enters the battlefield, create X Treasure tokens, where X is the number of artifacts and enchantments your opponents control. (Treasure tokens are artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.")
1 /
2
{G}{W}
Dromoka's Command
Instant
Choose two --
• Prevent all damage target instant or sorcery spell would deal this turn.
• Target player sacrifices an enchantment.
• Put a +1/+1 counter on target creature.
• Target creature you control fights target creature you don't control.
{X}{R}
Earthquake
Sorcery
Earthquake deals X damage to each creature without flying and each player.
{2}{W}{W}
Entangler
Enchantment - Aura
Enchant creature
Enchanted creature can block any number of creatures.
--
Exotic Orchard
Land
{T}: Add one mana of any color that a land an opponent controls could produce.
{1}{G}
Farseek
Sorcery
Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
{3}{G}{G}
Grothama, All-Devouring
Legendary Creature - Wurm
Other creatures have "Whenever this creature attacks, you may have it fight Grothama, All-Devouring."
When Grothama leaves the battlefield, each player draws cards equal to the amount of damage dealt to Grothama this turn by sources they controlled.
10 /
8
--
Gruul Guildgate
Land - Gate
Gruul Guildgate enters the battlefield tapped.
{T}: Add {R} or {G}.
{2}
Gruul Signet
Artifact
{1}, {T}: Add {R}{G}.
--
Gruul Turf
Land
Gruul Turf enters the battlefield tapped.
When Gruul Turf enters the battlefield, return a land you control to its owner's hand.
{T}: Add {R}{G}.
{W}
Guilty Conscience
Enchantment - Aura
Enchant creature
Whenever enchanted creature deals damage, Guilty Conscience deals that much damage to that creature.
{2}{G}{G}
Harmonize
Sorcery
Draw three cards.
{2}{G}
Hunter's Insight
Instant
Choose target creature you control. Whenever that creature deals combat damage to a player or planeswalker this turn, draw that many cards.
{R}{G}{W}
Jared Carthalion, True Heir
Legendary Creature - Human Warrior
When Jared Carthalion, True Heir enters the battlefield, target opponent becomes the monarch. You can't become the monarch this turn.
If damage would be dealt to Jared Carthalion while you're the monarch, prevent that damage and put that many +1/+1 counters on it.
3 /
3
--
Karplusan Forest
Land
{T}: Add {C}.
{T}: Add {R} or {G}. Karplusan Forest deals 1 damage to you.
--
Kessig Wolf Run
Land
{T}: Add {C}.
{X}{R}{G}, {T}: Target creature gets +X/+0 and gains trample until end of turn.
{2}
Lightning Greaves
Artifact - Equipment
Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip {0}
{1}{G}{W}
Mirri, Weatherlight Duelist
Legendary Creature - Cat Warrior
First strike
Whenever Mirri, Weatherlight Duelist attacks, each opponent can't block with more than one creature this combat.
As long as Mirri, Weatherlight Duelist is tapped, no more than one creature can attack you each combat.
3 /
2
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{1}{W}
Open the Armory
Sorcery
Search your library for an Aura or Equipment card, reveal it, put it into your hand, then shuffle.
{2}{W}{W}
Palace Jailer
Creature - Human Soldier
When Palace Jailer enters the battlefield, you become the monarch.
When Palace Jailer enters the battlefield, exile target creature an opponent controls until an opponent becomes the monarch.
2 /
2
{3}{W}
Palace Sentinels
Creature - Human Soldier
When Palace Sentinels enters the battlefield, you become the monarch.
2 /
4
{2}{W}
Pariah
Enchantment - Aura
Enchant creature
All damage that would be dealt to you is dealt to enchanted creature instead.
{5}
Pariah's Shield
Artifact - Equipment
All damage that would be dealt to you is dealt to equipped creature instead.
Equip {3}
{W}
Path to Exile
Instant
Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
{2}{R}{R}
Pyrohemia
Enchantment
At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pyrohemia.
{R}: Pyrohemia deals 1 damage to each creature and each player.
{1}{G}
Rampant Growth
Sorcery
Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
{G}
Rancor
Enchantment - Aura
Enchant creature
Enchanted creature gets +2/+0 and has trample.
When Rancor is put into a graveyard from the battlefield, return Rancor to its owner's hand.
{4}{G}{G}
Regal Behemoth
Creature - Dinosaur
Trample
When Regal Behemoth enters the battlefield, you become the monarch.
Whenever you tap a land for mana while you're the monarch, add an additional one mana of any color.
5 /
5
{1}{R}{G}
Rhythm of the Wild
Enchantment
Creature spells you control can't be countered.
Nontoken creatures you control have riot. (They enter the battlefield with your choice of a +1/+1 counter or haste.)
{4}{G}{G}
Rishkar's Expertise
Sorcery
Draw cards equal to the greatest power among creatures you control.
You may cast a spell with mana value 5 or less from your hand without paying its mana cost.
--
Rogue's Passage
Land
{T}: Add {C}.
{4}, {T}: Target creature can't be blocked this turn.
{X}{R}
Rolling Earthquake
Sorcery
Rolling Earthquake deals X damage to each creature without horsemanship and each player.
--
Sacred Foundry
Land - Mountain Plains
({T}: Add {R} or {W}.)
As Sacred Foundry enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.
{X}{R}{G}
Savage Twister
Sorcery
Savage Twister deals X damage to each creature.
{1}{W}
Saving Grace
Enchantment - Aura
Flash
Enchant creature you control
When Saving Grace enters the battlefield, all damage that would be dealt this turn to you and permanents you control is dealt to enchanted creature instead.
Enchanted creature gets +0/+3.
--
Selesnya Guildgate
Land - Gate
Selesnya Guildgate enters the battlefield tapped.
{T}: Add {G} or {W}.
{2}
Selesnya Signet
Artifact
{1}, {T}: Add {G}{W}.
{2}{G/W}
Shield of the Oversoul
Enchantment - Aura
Enchant creature
As long as enchanted creature is green, it gets +1/+1 and has indestructible. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it's still put into its owner's graveyard.)
As long as enchanted creature is white, it gets +1/+1 and has flying.
{1}{W}{W}
Shielded by Faith
Enchantment - Aura
Enchant creature
Enchanted creature has indestructible.
Whenever a creature enters the battlefield, you may attach Shielded by Faith to that creature.
{4}
Silent Arbiter
Artifact Creature - Construct
No more than one creature can attack each combat.
No more than one creature can block each combat.
1 /
5
{3}{W}{W}
Single Combat
Sorcery
Each player chooses a creature or planeswalker they control, then sacrifices the rest. Players can't cast creature or planeswalker spells until the end of your next turn.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{2}{R}{W}
Solar Blaze
Sorcery
Each creature deals damage to itself equal to its power.
{5}{R}{R}
Star of Extinction
Sorcery
Destroy target land. Star of Extinction deals 20 damage to each creature and each planeswalker.
{X}{R}{R}
Starstorm
Instant
Starstorm deals X damage to each creature.
Cycling {3} ({3}, Discard this card: Draw a card.)
--
Stomping Ground
Land - Mountain Forest
({T}: Add {R} or {G}.)
As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.
{4}{W}{W}
Sun Titan
Creature - Giant
Vigilance
Whenever Sun Titan enters the battlefield or attacks, you may return target permanent card with mana value 3 or less from your graveyard to the battlefield.
6 /
6
{3}
Sunforger
Artifact - Equipment
Equipped creature gets +4/+0.
{R}{W}, Unattach Sunforger: Search your library for a red or white instant card with mana value 4 or less and cast that card without paying its mana cost. Then shuffle.
Equip {3}
{2}
Swiftfoot Boots
Artifact - Equipment
Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)
Equip {1}
{3}
Sword of Vengeance
Artifact - Equipment
Equipped creature gets +2/+0 and has first strike, vigilance, trample, and haste.
Equip {3}
{W}
Swords to Plowshares
Instant
Exile target creature. Its controller gains life equal to its power.
{2}
Talisman of Conviction
Artifact
{T}: Add {C}.
{T}: Add {R} or {W}. Talisman of Conviction deals 1 damage to you.
{2}
Talisman of Impulse
Artifact
{T}: Add {C}.
{T}: Add {R} or {G}. Talisman of Impulse deals 1 damage to you.
{2}
Talisman of Unity
Artifact
{T}: Add {C}.
{T}: Add {G} or {W}. Talisman of Unity deals 1 damage to you.
{2}{W}
Timely Ward
Enchantment - Aura
You may cast Timely Ward as though it had flash if it targets a commander.
Enchant creature
Enchanted creature has indestructible.
{G}
Ulvenwald Tracker
Creature - Human Shaman
{1}{G}, {T}: Target creature you control fights another target creature.
1 /
1
{1}{R}
Underworld Breach
Enchantment
Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)
At the beginning of the end step, sacrifice Underworld Breach.
{1}{R}{ // }{W}
Wear // Tear
Instant // Instant
Destroy target artifact.
Fuse (You may cast one or both halves of this card from your hand.)
Destroy target enchantment.
Fuse (You may cast one or both halves of this card from your hand.)
{3}
Whispersilk Cloak
Artifact - Equipment
Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)