Tervigon

Haste, Defender
Hive Mind (Whenever another tyranid enters
the battlefield, you gain 1 bio counter, and 1 life.)
{u}{r}{g}, Pay 3 bio counters : Create a 2/2
Tyranid gaunt creature token with haste.
{2}{u}{r}{g}, Pay 5 bio counters : Create a 3/2
Tyranid gaunt creature token with menace and lifelink.