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.

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.

Force Spike

Counter target spell unless its controller pays {1}.

Remove Soul

Phantom Monster

Control Magic

Enchant creature
You control enchanted creature.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Prodigal Sorcerer

{T}: Prodigal Sorcerer deals 1 damage to any target.

Mishra's Factory

{T}: Add {C}.
{1}: Mishra's Factory becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Air Elemental

Azure Drake

Amnesia

Target player reveals their hand and discards all nonland cards.

Jalum Tome

{2}, {T}: Draw a card, then discard a card.

Stone Rain

Merfolk of the Pearl Trident

Flying Men

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.

Gaseous Form

Enchant creature
Prevent all combat damage that would be dealt to and dealt by enchanted creature.

Sol Ring

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.

Island

Mana Drain

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Clone

You may have Clone enter as a copy of any creature on the battlefield.

Ghost Ship

Pyrotechnics

Pyrotechnics deals 4 damage divided as you choose among any number of targets.

Mountain

Spell Blast

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)