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.

Wall of Swords

Defender (This creature can't attack.)
Flying

Wrath of God

Destroy all creatures. They can't be regenerated.

Island

White Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from black (This creature can't be blocked, targeted, dealt damage, or enchanted by anything black.)

Unsummon

Return target creature to its owner's hand.

Wall of Wonder

Defender (This creature can't attack.)
{2}{U}{U}: Wall of Wonder gets +4/-4 until end of turn and can attack this turn as though it didn't have defender.

Flying Men

Giant Tortoise

Giant Tortoise gets +0/+3 as long as it's untapped.

Holy Day

Prevent all combat damage that would be dealt this turn.

Air Elemental

Abu Ja'far

When Abu Ja'far dies, destroy all creatures blocking or blocked by it. They can't be regenerated.

Counterspell

Control Magic

Enchant creature
You control enchanted creature.

Plains

Water Elemental

Karakas

{T}: Add {W}.
{T}: Return target legendary creature to its owner's hand.