Kraven, Sinister Savage

Indestructible
Champion a Hero (When this enters the battlefield,
sacrifice it unless you exile another Hero you control.
When this leaves the battlefield, that card returns to
the battlefield.)
Kraven Serum —{b}{r}{g}: Kraven, Sinister Savage
or another target Villain you control gains your
choice of trample, reach, or deathtouch
until end of turn.