Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

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.

Braingeyser

Disenchant

Wrath of God

Destroy all creatures. They can't be regenerated.

Plains

Sol Ring

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Counterspell

Spell Blast

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

Balance

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.