Esi, God of the Tempest

Hexproof, Prowess, Protection from all creatures
Holy Tempest-Whenever you cast a noncreature spell, 3 target creatures gain a tempest counter.
All creatures you control gain +{x}/+{x}, where {x} is the number of tempest counters on all creatures you control.
Remove 10 tempest counters from creatures you control: Destroy all permanents from target opponent's board