Advent Savior

As an additional cost to cast this spell,
pay {x} where X is your life total.
Hexproof
While Advent Savior is on the battlefield, your
life total cant be reduced below 1.
When you take combat damage, put that many
+1/+1 counters on Advent Savior, it gains flying
and becomes an Angel Cleric instead of its other
creature types, then exile that many card from
the top of your library.