Black Lotus

{T}, Sacrifice Black Lotus: Add three mana of any one color.

Howling Mine

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

Mons's Goblin Raiders

Forest

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.)

Mox Emerald

Kird Ape

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

Goblin Balloon Brigade

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

Taiga

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

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.

Mountain

Llanowar Elves

Goblin King

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

Gauntlet of Might

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

Mox Ruby

Elvish Archers

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.)