Thoa, Arcane Protector

Vigilance, Prowess
Abjure—{w}{w}, Discard a card: Put a shield counter on up to two target creatures.
Conjure—{w/u}{w/u}{w/u}, Discard a card: Create a 4/4 elemental creature token with either a vigilance, flying, double strike, or trample counter on it.
Counter—{u}{u}, Discard a card: counter target instant or sorcery spell.
When Thoa dies, return it to the battlefield transformed.