Whenever one or more modified creatures you control attack, untap all modified creatures you control. After this combat phase, there is an additional combat phase. This ability triggers only once each turn. (Equipment, Auras you control, and counters are modifications.)

Whenever a creature an opponent controls dies, Altac Bloodseeker gets +2/+0 and gains first strike and haste until end of turn. (It deals combat damage before creatures without first strike, and it can attack and {T} as soon as it comes under your control.)

Haste

As long as Anger is in your graveyard and you control a Mountain, creatures you control have haste.

Bloodcrazed Neonate attacks each combat if able.

Whenever Bloodcrazed Neonate deals combat damage to a player, put a +1/+1 counter on it.

Whenever Bloodmad Vampire deals combat damage to a player, put a +1/+1 counter on it.

Madness {1}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Flying, trample

Whenever Bloodthirster deals combat damage to a player, untap it. After this combat phase, there is an additional combat phase.

Bloodthirster can't attack a player it has already attacked this turn.

Enchant creature you control

When enchanted creature deals combat damage to a player, sacrifice it and attach Breath of Fury to a creature you control. If you do, untap all creatures you control and after this phase, there is an additional combat phase.

If Combat Celebrant hasn't been exerted this turn, you may exert it as it attacks. When you do, untap all other creatures you control and after this phase, there is an additional combat phase. (An exerted creature won't untap during your next untap step.)

Whenever Delina, Wild Mage attacks, choose target creature you control, then roll a d20.

1--14 | Create a tapped and attacking token that's a copy of that creature, except it's not legendary and it has "At end of combat, exile this creature."

15--20 | Create one of those tokens. You may roll again.

Haste

Whenever Erdwal Ripper deals combat damage to a player, put a +1/+1 counter on it.

Whenever Falkenrath Exterminator deals combat damage to a player, put a +1/+1 counter on it.

{2}{R}: Falkenrath Exterminator deals damage to target creature equal to the number of +1/+1 counters on Falkenrath Exterminator.

Flying, haste

Whenever Falkenrath Marauders deals combat damage to a player, put two +1/+1 counters on it.

You may exile two red cards from your hand rather than pay this spell's mana cost.

Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.

When Godo, Bandit Warlord enters the battlefield, you may search your library for an Equipment card, put it onto the battlefield, then shuffle.

Whenever Godo attacks for the first time each turn, untap it and all Samurai you control. After this phase, there is an additional combat phase.

Whenever Havengul Vampire deals combat damage to a player, put a +1/+1 counter on it.

Whenever another creature dies, put a +1/+1 counter on Havengul Vampire.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Whenever Heirs of Stromkirk deals combat damage to a player, put a +1/+1 counter on it.

Flying, haste

Whenever Hellkite Charger attacks, you may pay {5}{R}{R}. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.

At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary. That token gains haste.

Equip {5}

For Mirrodin! (When this Equipment enters the battlefield, create a 2/2 red Rebel creature token, then attach this to it.)

Equipped creature gets +2/+2.

Whenever equipped creature attacks, if it's the first combat phase of the turn, untap each attacking creature. After this phase, there is an additional combat phase.

Equip {3}{R}

Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase.

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

Berzerker -- Khârn the Betrayer attacks or blocks each combat if able.

Sigil of Corruption -- When you lose control of Khârn the Betrayer, draw two cards.

The Betrayer -- If damage would be dealt to Khârn the Betrayer, prevent that damage and an opponent of your choice gains control of it.

Double strike, haste

Whenever Lightning Runner attacks, you get {E}{E} (two energy counters), then you may pay {E}{E}{E}{E}{E}{E}{E}{E}. If you pay, untap all creatures you control, and after this phase, there is an additional combat phase.

Double strike

Whenever Markov Blademaster deals combat damage to a player, put a +1/+1 counter on it.

Each creature you control gets +1/+0 for each time it has attacked this turn.

Landfall -- Whenever a land enters the battlefield under your control, if it's your main phase, there's an additional combat phase after this phase. At the beginning of that combat, untap all creatures you control.

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

Whenever Port Razer deals combat damage to a player, untap each creature you control. After this phase, there is an additional combat phase.

Port Razer can't attack a player it has already attacked this turn.

At the beginning of combat on your turn, target creature you control gets +1/+0 and gains haste until end of turn.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

At the beginning of combat on your turn, target creature you control gets +2/+0 and gains trample and haste until end of turn.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.

At the beginning of combat on your turn, create X tokens that are copies of another target creature you control, where X is one plus the number of instant and sorcery spells you've cast this turn. They gain haste. Exile them at the beginning of the next end step.

Flying

Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)

Whenever Scourge of the Throne attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures. After this phase, there is an additional combat phase.

Untap target creature. After this main phase, there is an additional combat phase followed by an additional main phase.

Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Haste

Whenever Slith Firewalker deals combat damage to a player, put a +1/+1 counter on it.

Attacking creatures you control have first strike.

Whenever a Vampire you control deals combat damage to a player, put a +1/+1 counter on it.

Madness {2}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Stromkirk Noble can't be blocked by Humans.

Whenever Stromkirk Noble deals combat damage to a player, put a +1/+1 counter on it.

Haste

{1}: Another target creature with power 2 or less can't be blocked this turn.

{1}{R}, {T}, Discard your hand: Until end of turn, whenever a creature you control with power 2 or less deals combat damage to a player, draw a card.

Trample

Pack tactics -- Whenever Tiger-Tribe Hunter attacks, if you attacked with creatures with total power 6 or greater this combat, you may sacrifice another creature. When you do, Tiger-Tribe Hunter deals damage equal to the sacrificed creature's power to target creature.

After the first postcombat main phase this turn, there's an additional combat phase followed by an additional main phase. At the beginning of that combat, untap all creatures that attacked this turn.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

+1: Creatures you control get +1/+0 and gain haste until end of turn.

0: Create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."

-6: You get an emblem with "At the end of the first combat phase on your turn, untap target creature you control. After this phase, there is an additional combat phase."