Keyword: Haste

Affinity for Mountains (This spell costs less to cast for each Mountain you control.)
Haste

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

Haste
: Pyre Charger gets +1/+0 until end of turn.

Flying, first strike, vigilance, trample, haste, protection from black and from red

Haste
When Tuktuk the Explorer dies, create Tuktuk the Returned, a legendary 5/5 colorless Goblin Golem artifact creature token.

Flying, haste
Lieutenant — As long as you control your commander, Tyrant’s Familiar gets +2/+2 and has “Whenever Tyrant’s Familiar attacks, it deals 7 damage to target creature defending player controls.”

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

Flash
Haste

Haste
Whenever you cast a spell, if it’s the second creature spell you cast this turn, you may return Vengevine from your graveyard to the battlefield.

Haste (This creature can attack and as soon as it comes under your control.)
: Kamahl, Pit Fighter deals 3 damage to any target.

Trample, haste
At the beginning of the end step, sacrifice Hellspark Elemental.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Haste
Storm Entity enters the battlefield with a +1/+1 counter on it for each other spell cast this turn.

Haste
Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When Avalanche Riders enters the battlefield, destroy target land.

Haste
Whenever Ankle Shanker attacks, creatures you control gain first strike and deathtouch until end of turn.

Haste
Zurgo Helmsmasher attacks each combat if able.
Zurgo Helmsmasher has indestructible as long as it’s your turn.
Whenever a creature dealt damage by Zurgo Helmsmasher this turn dies, put a +1/+1 counter on Zurgo Helmsmasher.

Haste
Whenever Ankle Shanker attacks, creatures you control gain first strike and deathtouch until end of turn.

Haste
Zurgo Helmsmasher attacks each combat if able.
Zurgo Helmsmasher has indestructible as long as it’s your turn.
Whenever a creature dealt damage by Zurgo Helmsmasher this turn dies, put a +1/+1 counter on Zurgo Helmsmasher.

Haste
Valley Dasher attacks each combat if able.

Flying, vigilance, haste

Haste
Whenever Ankle Shanker attacks, creatures you control gain first strike and deathtouch until end of turn.

Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Flying, first strike, haste

Haste
At the beginning of your upkeep, return a red creature you control to its owner’s hand.

Flying, vigilance, haste

Haste
Zurgo Helmsmasher attacks each combat if able.
Zurgo Helmsmasher has indestructible as long as it’s your turn.
Whenever a creature dealt damage by Zurgo Helmsmasher this turn dies, put a +1/+1 counter on Zurgo Helmsmasher.