Mountain Goat

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Sparkspitter

{R}, {T}, Discard a card: Create a 3/1 red Elemental creature token named Spark Elemental. It has trample, haste, and "At the beginning of the end step, sacrifice this token."

Slith Ascendant

Flying
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.

Dragonsoul Knight

First strike
{W}{U}{B}{R}{G}: Until end of turn, this creature becomes a Dragon, gets +5/+3, and gains flying and trample.

Inner-Flame Igniter

{2}{R}: Creatures you control get +1/+0 until end of turn. If this is the third time this ability has resolved this turn, creatures you control gain first strike until end of turn.