Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Phantom Monster

Control Magic

Enchant creature
You control enchanted creature.

Energy Flux

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {2}."

Time Elemental

When this creature attacks or blocks, at end of combat, sacrifice it and it deals 5 damage to you.
{2}{U}{U}, {T}: Return target permanent that isn't enchanted to its owner's hand.

Psychic Venom

Enchant land
Whenever enchanted land becomes tapped, this Aura deals 2 damage to that land's controller.

Mahamoti Djinn

Flying (This creature can't be blocked except by creatures with flying or reach.)

Power Leak

Enchant enchantment
At the beginning of the upkeep of enchanted enchantment's controller, that player may pay any amount of mana. This Aura deals 2 damage to that player. Prevent X of that damage, where X is the amount of mana that player paid this way.

Giant Tortoise

This creature gets +0/+3 as long as it's untapped.

Ghost Ship

Flying
{U}{U}{U}: Regenerate this creature.

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.

Twiddle

You may tap or untap target artifact, creature, or land.

Drain Power

Target player activates a mana ability of each land they control. Then that player loses all unspent mana and you add the mana lost this way.