Neothelid

As an additional cost to cast this spell, sacrifice
any number of creatures. This spell costs {2} less
to cast for each creature sacrificed this way.
At the beginning of your upkeep, sacrifice all
creatures you control with toughness 2 or less.
Then, surveil X and put X +1/+1 counters on
Neothelid, where X is twice the number of
creatures sacrificed this way.
"That's no tadpole..."