Goblin Balloon Brigade

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

Erhnam Djinn

At the beginning of your upkeep, target non-Wall creature an opponent controls gains forestwalk until your next upkeep. (It can't be blocked as long as defending player controls a Forest.)

Berserk

Cast this spell only before the combat damage step.
Target creature gains trample and gets +X/+0 until end of turn, where X is its power. At the beginning of the next end step, destroy that creature if it attacked this turn.

Taiga

Mons's Goblin Raiders

Gauntlet of Might

Red creatures get +1/+1.
Whenever a Mountain is tapped for mana, its controller adds an additional {R}.

Mountain

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Timber Wolves

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Elvish Archers

Orcish Oriflamme

Attacking creatures you control get +1/+0.

Llanowar Elves

Goblin King

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

Kird Ape

Kird Ape gets +1/+2 as long as you control a Forest.

Mox Ruby

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.