Orcish Oriflamme

Attacking creatures you control get +1/+0.

Goblin King

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

Mox Ruby

Black Vise

As Black Vise enters, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Orcish Artillery

{T}: Orcish Artillery deals 2 damage to any target and 3 damage to you.

Iron Star

Whenever a player casts a red spell, you may pay {1}. If you do, you gain 1 life.

Earthquake

Earthquake deals X damage to each creature without flying and each player.

Gauntlet of Might

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

Plains

Disenchant

Fork

Copy target instant or sorcery spell, except that the copy is red. You may choose new targets for the copy.

Savannah Lions

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.

Mountain

Sol Ring

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Goblin Balloon Brigade

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

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Wheel of Fortune

Each player discards their hand, then draws seven cards.