Fiery Hellhound

{R}: Fiery Hellhound gets +1/+0 until end of turn.

Earthquake

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

Mountain

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Sparkmage Apprentice

When Sparkmage Apprentice enters, it deals 1 damage to any target.

Dragon Whelp

Flying
{R}: Dragon Whelp gets +1/+0 until end of turn. If this ability has been activated four or more times this turn, sacrifice Dragon Whelp at the beginning of the next end step.

Jackal Familiar

Jackal Familiar can't attack or block alone.

Act of Treason

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and {T} this turn.)

Magma Phoenix

Flying
When Magma Phoenix dies, it deals 3 damage to each creature and each player.
{3}{R}{R}: Return Magma Phoenix from your graveyard to your hand.

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.

Raging Goblin

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