Facehugger

Host (When this creature blocks or attacks and is
blocked, you may pay {1}{b/g} to enchant the blocking or attacking creature with this creature. At the beginning
of the players Main Phase, add a -1/-1 counter to the enchanted creature. When this creature dies, search
Your deck for a Xenomorph with the same typing or ability and play it, if it costs 1 more or less.
It has that many +1/+1 counters as
the dead creatures -1/-1 counters )