Shock

Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Shivan Raptor

First strike, haste
Echo {2}{R} (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.)

Thundering Giant

Flametongue Kavu

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

Viashino Cutthroat

Haste
At the beginning of the end step, return Viashino Cutthroat to its owner's hand.

Mountain

Onslaught

Whenever you cast a creature spell, tap target creature.

Arc Lightning

Arc Lightning deals 3 damage divided as you choose among one, two, or three targets.

Keldon Champion

Haste
Echo {2}{R}{R} (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 Keldon Champion enters, it deals 3 damage to target player or planeswalker.

Downhill Charge

You may sacrifice a Mountain rather than pay this spell's mana cost.
Target creature gets +X/+0 until end of turn, where X is the number of Mountains you control.

Wild Colos

Blazing Salvo

Blazing Salvo deals 3 damage to target creature unless that creature's controller has Blazing Salvo deal 5 damage to them.

Goblin War Buggy

Haste
Echo {1}{R} (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.)