Mardu goblin battalion

{3}{R}{R}: Untap all creatures you control. After this main phase, there is an additional combat phase followed by an additional main phase. Activate this ability only any time you could cast a sorcery.

(Ancient Den isn't a spell.)

{T}: Add {W}.

Flying

At the beginning of each combat, choose first strike, vigilance, or lifelink. Creatures you control gain that ability until end of turn.

Flying

Battle Squadron's power and toughness are each equal to the number of creatures you control.

Attacking creatures you control have double strike.

Add {R} for each Goblin on the battlefield.

Flying

Sacrifice another creature: Butcher of the Horde gains your choice of vigilance, lifelink, or haste until end of turn.

Creatures you control gain double strike until end of turn. (They deal both first-strike and regular combat damage.)

Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it. (For example, if two Goblin Warriors and a Goblin Shaman are on the battlefield, each gets +2/+2.)

Create two 1/1 red Goblin creature tokens.

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.

Target opponent loses 1 life for each attacking creature you control. You gain that much life.

At the beginning of your upkeep, create a 1/1 red Goblin creature token with haste.

Goblin creatures attack each combat if able.

Trample

Goblin Goon can't attack unless you control more creatures than defending player.

Goblin Goon can't block unless you control more creatures than attacking player.

Protection from blue (This creature can't be blocked, targeted, dealt damage, or enchanted by anything blue.)

Whenever Goblin Piledriver attacks, it gets +2/+0 until end of turn for each other attacking Goblin.

Other Goblin creatures you control attack each combat if able.

At the beginning of combat on your turn, create a 1/1 red Goblin creature token with haste.

Whenever Goblin Rabblemaster attacks, it gets +1/+0 until end of turn for each other attacking Goblin.

Create four 1/1 red Goblin creature tokens.

{1}{R}, Sacrifice a land: Put a +1/+1 counter on Goblin Razerunners.

At the beginning of your end step, you may have Goblin Razerunners deal damage equal to the number of +1/+1 counters on it to target player or planeswalker.

Goblin War Strike deals damage to target player or planeswalker equal to the number of Goblins you control.

Goblin spells you cast cost {1} less to cast.

Goblins you control have haste.

{2}{R}, Sacrifice two Goblins: Create three 1/1 red Goblin creature tokens.

Whenever you cast a noncreature spell, you may pay {1}. If you do, create a 1/1 red Goblin creature token with haste.

Whenever Honored Crop-Captain attacks, other attacking creatures get +1/+0 until end of turn.

Whenever a creature enters the battlefield under your control, Impact Tremors deals 1 damage to each opponent.

Untap all creatures and gain control of them until end of turn. They gain haste until end of turn.

Indestructible

As long as your devotion to red and white is less than seven, Iroas isn't a creature.

Creatures you control have menace.

Prevent all damage that would be dealt to attacking creatures you control.

Whenever a nontoken creature you control attacks, create a 1/1 red Goblin creature token that's tapped and attacking.

Sacrifice Mardu Ascendancy: Creatures you control get +0/+3 until end of turn.

({T}: Add {R}.)

Destroy target creature.

({T}: Add {W}.)

When Ponyback Brigade enters the battlefield or is turned face up, create three 1/1 red Goblin creature tokens.

Morph {2}{R}{W}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

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

Flying, haste

({T}: Add {B}.)

{T}, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.

Whenever another creature you control dies, put a +1/+1 counter on Unruly Mob.

Wind-Scarred Crag enters the battlefield tapped.

When Wind-Scarred Crag enters the battlefield, you gain 1 life.

{T}: Add {R} or {W}.