Beast Man, Savage Henchman

Echo {1}{r}{g} (At the beginning of your upkeep,
if this came under your control since the
beginning of your last upkeep, sacrifice it unless
you pay it's echo cost.)
When Beast Man, Savage Henchman enters the
battlefield, gain control of target beast or
dinosaur. Sacrifice that creature at the beginning
of your next end step, unless you pay the echo
cost for this card.