Stone Giant

{T}: Target creature you control with toughness less than this creature's power gains flying until end of turn. Destroy that creature at the beginning of the next end step.

Pyroclasm

Pyroclasm deals 2 damage to each creature.

Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Seismic Strike

Seismic Strike deals damage to target creature equal to the number of Mountains you control.

Dragon's Claw

Whenever a player casts a red spell, you may gain 1 life.

Burning Inquiry

Each player draws three cards, then discards three cards at random.

Manabarbs

Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.

Earthquake

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

Warp World

Each player shuffles all permanents they own into their library, then reveals that many cards from the top of their library. Each player puts all artifact, creature, and land cards revealed this way onto the battlefield, then does the same for enchantment cards, then puts all cards revealed this way that weren't put onto the battlefield on the bottom of their library.

Yawning Fissure

Each opponent sacrifices a land of their choice.

Capricious Efreet

At the beginning of your upkeep, choose target nonland permanent you control and up to two target nonland permanents you don't control. Destroy one of them at random.

Mountain

Inferno Elemental

Whenever this creature blocks or becomes blocked by a creature, this creature deals 3 damage to that creature.

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice this creature.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Howling Mine

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