Goblin King

Other Goblins get +1/+1 and have mountainwalk.

Rock Hydra

Rock Hydra enters with X +1/+1 counters on it.
For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.
{R}: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.
{R}{R}{R}: Put a +1/+1 counter on Rock Hydra. Activate only during your upkeep.

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Goblin Balloon Brigade

{R}: Goblin Balloon Brigade gains flying until end of turn.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Taiga

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Savannah Lions

Mons's Goblin Raiders

Plains

Sol Ring

Shivan Dragon

Flying
{R}: This creature gets +1/+0 until end of turn.