Control Magic

Enchant creature
You control enchanted creature.

Braingeyser

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.

Shatter

Sol Ring

Stone Rain

Clone

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

Counterspell

Island

Unsummon

Return target creature to its owner's hand.

Prodigal Sorcerer

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

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.

Volcanic Island

Mountain

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Serendib Efreet

Flying
At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

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.

Wheel of Fortune

Each player discards their hand, then draws seven cards.

Lord of Atlantis

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Pirate Ship

Pirate Ship can't attack unless defending player controls an Island.
{T}: Pirate Ship deals 1 damage to any target.
When you control no Islands, sacrifice Pirate Ship.