Sorin, life captain

When Sorin, life captain enters the battlefield you
gain 10 life.
During your upkeep you gain life equal to the
power of target creature.
{x}{t} gain {x} life.
You can return Sorin, life captain to your hand anytime unless target opponent pays 3 life.
You can cast Sorin, life captain from your
graveyard or from exile.