Mehre, Master Cryomancer

+1: Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.
-2: Until your next turn, whenever a creature you control blocks a creature, that creature doesn't untap during its controller's next untap step.
-6: Tap all lands and creatures your opponents controls. They doesn't untap during their controller's next two untap steps.