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.

Goblin Balloon Brigade

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

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Firebreathing

Enchant creature
{R}: Enchanted creature gets +1/+0 until end of 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.

Hill Giant

Granite Gargoyle

Flying
{R}: Granite Gargoyle gets +0/+1 until end of turn.

Sol Ring

Atog

Sacrifice an artifact: Atog gets +2/+2 until end of turn.

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.

Brass Man

Brass Man doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {1}. If you do, untap Brass Man.