Benemoth, Swarmlord

Eminence — At the beginnning of your upkeep, if Benemoth, Swarmlord is in your command zone or
on the battlefield, you may pay {x} and create a copy of target Tryanid you control, where X the converted mana cost of the targeted Tryanid.

Double strike
Tryanids you control get +1/+1 and trample.
{1}, Sacrifice a Tryanid: Regenerate Benemoth, Swarmlord, then put a +1/+1 counter on it.