Silchas Ruin, Chaos Sealer

As long as Silchas Ruin is untapped, creatures you control have hexproof.

As long as it's your turn, Silchas Ruin has base
power and toughness 4/4 and has flying.

The brother of Anomander and Andarist, for ever
deemed the coldest of the three, the cruellest, Silchas
Ruin flew, a white leviathan with murder in its
heart . . . white as bone, with eyes red as death.