Anti Mage

Haste
Mana Break — {t}, {x}: Tap X lands target opponent controls. They don't untap
during that players next untap step.
Counterspell — {t}, {x}: Counter target spell
with mana value X.
Mana Void — {t}, {u/b}{u/b}{u/b}: Deal damage to
any target equal to the number of
taped lands that player controls.