Maleceptor

Synapse (Every creature you control lose Instinctive Behavior for as long as a permanent you control on the battlefield as Synapse.)
Whenever you cast a Tyranid spell you may
put a +1/+1 on Maleceptor.
You may remove 3 +1/+1 counters from
Maleceptor to add {3} to your mana pool