Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of card types among cards in all graveyards.

Lhurgoyf creatures you control have trample.

{T}: Add one mana of any color in your commander's color identity.

Flying

{T}: Add one mana of any color.

Equipped creature gets +2/+0 and has shroud. (It can't be the target of spells or abilities.)

Whenever a Rogue creature enters the battlefield, you may attach Cloak and Dagger to it.

Equip {3}

Flying

As an additional cost to cast blue permanent spells, you may pay 2 life. Those spells cost {U} less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay.

Whenever you cast a blue permanent spell, draw a card.

First strike

As an additional cost to cast red permanent spells, you may pay 2 life. Those spells cost {R} less to cast if you paid life this way. This effect reduces only the amount of red mana you pay.

Whenever you cast a red permanent spell, Defiler of Instinct deals 1 damage to any target.

Trample

As an additional cost to cast green permanent spells, you may pay 2 life. Those spells cost {G} less to cast if you paid life this way. This effect reduces only the amount of green mana you pay.

Whenever you cast a green permanent spell, put a +1/+1 counter on each creature you control.

Delayed Blast Fireball deals 2 damage to each opponent and each creature they control. If this spell was cast from exile, it deals 5 damage to each opponent and each creature they control instead.

Foretell {4}{R}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Equipped creature has "Whenever you draw a card, this creature gets +1/+1 and gains flying until end of turn" and "{4}: Draw a card."

Whenever a Wizard creature enters the battlefield, you may attach Diviner's Wand to it.

Equip {3}

Spells you cast from your graveyard or from exile cost {2} less to cast.

Plotting cards from your hand costs {2} less.

Enchant creature

Enchanted creature gets +10/+10 and has trample and annihilator 2. (Whenever it attacks, defending player sacrifices two permanents.)

Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token.

Whenever you cast a spell from exile or a land enters the battlefield under your control from exile, create a 2/2 green Wolf creature token.

{1}, {T}, Discard a card: Exile the top card of your library. You may play it this turn.

{T}: Add one mana of any color that a land an opponent controls could produce.

When Flametongue Kavu enters the battlefield, it deals 4 damage to target creature.

Menace

Paradox -- Whenever you cast a spell from anywhere other than your hand, Flaming Tyrannosaurus deals 3 damage to any target. Then put a +1/+1 counter on Flaming Tyrannosaurus.

When Flaming Tyrannosaurus dies, it deals damage equal to its power to each opponent.

Trample

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)

Other creatures you control have trample and ward {2}.

Paradox -- Whenever you cast a spell from anywhere other than your hand, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")

Doctor's companion (You can have two commanders if the other is the Doctor.)

Paradox -- Impending Flux deals X damage to each opponent and each creature they control, where X is 1 plus the number of spells you've cast from anywhere other than your hand this turn.

Foretell {1}{R}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Trample

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Paradox -- Whenever you cast a spell from anywhere other than your hand, create a 2/2 red Alien Warrior creature token.

Negative -- As long as K-9, Mark I is untapped, other legendary creatures you control have ward {1}.

Affirmative -- {1}{U}, {T}: Target legendary creature can't be blocked this turn.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Whenever a modified creature you control attacks, exile the top card of your library. You may play that card this turn. (Equipment, Auras you control, and counters are modifications.)

Whenever you cast a spell from exile, put a +1/+1 counter on target creature you control.

First strike, haste

Symphony of Pain -- Whenever you cast a spell from anywhere other than your hand, Keeper of Secrets deals damage equal to that spell's mana value to target opponent.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)

Equip {0}

Enchant creature

Enchanted creature is a Treefolk with base power and toughness 0/4 and loses all abilities.

Ward {1}

At the beginning of your upkeep, exile the top X cards of your library, where X is the number of card types among other nonland permanents you control. You may play those cards this turn.

Paradox -- Whenever you cast a spell from anywhere other than your hand, Memory Worm deals 2 damage to target player. That player discards a card, then draws a card. Put a +1/+1 counter on Memory Worm.

Flying

Whenever you cast a spell from anywhere other than your hand, you may pay {1}{U/R}. If you do, copy that spell and you may choose new targets for the copy. If the copy is a permanent spell, it gains haste and "At the beginning of your end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.)

Flying

Whenever you cast a spell from exile, copy it. You may choose new targets for the copy. If it's a permanent spell, the copy gains haste and "At the beginning of the end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.)

Equipped creature gets +2/+1 and has haste.

Whenever a Warrior creature enters the battlefield, you may attach Obsidian Battle-Axe to it.

Equip {3}

When you cast this spell, create a token that's a copy of it, except it isn't legendary.

{T}: Add {C}. Spend this mana only to cast an artifact spell or activate an ability of an artifact.

Paradox -- Whenever you cast a spell from anywhere other than your hand, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Commander creatures you own have "Whenever you cast a spell from exile, this creature deals damage equal to that spell's mana value to target opponent."

When Reclamation Sage enters the battlefield, you may destroy target artifact or enchantment.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

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.)

Flying

Spells you cast from anywhere other than your hand cost {2} less to cast.

Foretell {4}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

When Savvy Trader enters the battlefield, exile target permanent card from your graveyard. You may play that card for as long as it remains exiled.

Spells you cast from anywhere other than your hand cost {1} less to cast.

Look at the top three cards of your library. Put one of those cards into your hand and the rest on the bottom of your library in any order. If this spell was cast from anywhere other than your hand, put each of those cards into your hand instead.

Sisterhood of Karn enters the battlefield with a +1/+1 counter on it.

Paradox -- Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on Sisterhood of Karn.

{T}: Add {C}{C}.

Flying, vigilance

Other creatures you control have ward {2}.

Suspend 6--{1}{U} (Rather than cast this card from your hand, you may pay {1}{U} and exile it with six time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Paradox -- Draw a card for each spell you've cast this turn from anywhere other than your hand.

Foretell {1}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)

Equip {1}

Whenever a land enters the battlefield under your control from anywhere other than your hand or you cast a spell from anywhere other than your hand, create a 3/3 red Spawn creature token.

Paradox -- Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature.

Team TARDIS -- At the beginning of your end step, untap each creature you control with a counter on it.

The first spell you cast from anywhere other than your hand each turn has demonstrate. (When you cast that spell, you may copy it. If you do, choose an opponent to also copy it. A copy of a permanent spell becomes a token.)

Whenever you copy a spell, put a +1/+1 counter on The Twelfth Doctor.

Equipped creature has "{2}, {T}: This creature deals 1 damage to any target" and "Whenever a creature dies, untap this creature."

Whenever a Shaman creature enters the battlefield, you may attach Thornbite Staff to it.

Equip {4}

Trample

Once each turn, you may pay {0} rather than pay the mana cost for a creature spell you cast from exile.

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Exile target creature card from your graveyard. Until the end of your next turn, you may cast that card. (Then exile this card. You may cast the creature later from exile.)

{T}: You may exile an instant or sorcery card from your hand and put three hone counters on it. It gains "At the beginning of your upkeep, if this card is exiled, remove a hone counter from it" and "When the last hone counter is removed from this card, if it's exiled, you may cast it. It costs {4} less to cast this way."

At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells.

Whenever you cast a spell from exile, put a +1/+1 counter on Nassari, Dean of Expression.

Equipped creature has "Whenever this creature attacks or blocks, it gets +1/+1 until end of turn for each attacking creature."

Whenever a Soldier creature enters the battlefield, you may attach Veteran's Armaments to it.

Equip {2}

Vigilance

{T}: Add an amount of {C} equal to Vhal, Candlekeep Researcher's toughness. This mana can't be spent to cast spells from your hand.

Choose a Background (You can have a Background as a second commander.)

The first spell you cast from exile each turn has cascade. (When you cast your first spell from exile, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Permanents you control have ward {2}.

At the beginning of your end step, mill two cards, then exile a nonland card at random from your graveyard. Copy it. You may cast the copy without paying its mana cost. (A copy of a permanent spell becomes a token.)