Ovimorph

Whenever an opponent attacks you, instead sacrifice
one Ovimorph, tap target attacking creature, and
place {x} counters on that creature. For each round,
remove one counter from that creature. When there
are no counters on said creature, the creature dies and
you gain one Xenomorph token creature that is a
copy of the host creature in addition to having an
additional +1/+1 counter along with the Deathtouch
keyword.