Shivan Dragon

Flying
{R}: This creature gets +1/+0 until end of turn.

Wall of Fire

Defender (This creature can't attack.)
{R}: Wall of Fire gets +1/+0 until end of turn.

Mountain

Onulet

Mana Flare

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Soul Net

Whenever a creature dies, you may pay {1}. If you do, you gain 1 life.

Detonate

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Power Surge

At the beginning of each player's upkeep, Power Surge deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn.

Disintegrate

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.

Inferno

Inferno deals 6 damage to each creature and each player.

The Hive

{5}, {T}: Create a 1/1 colorless Insect artifact creature token with flying named Wasp. (It can't be blocked except by creatures with flying or reach.)

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.