Adi Tivin, Vastiara Defender

{2}{g}{w}: Adi Tivin, Vastiara Defender has X
+1/+1 counters, where X is your life total.
Adi Tivin, Vastiara Defender gains double
strike until end of turn.
Cascade (When you cast this spell, exile cards from
the top of your library until you exile a nonland card
that costs less. You may cast it without paying its mana
cost. Put the exiled cards on the bottom of your library
in a random order.)