The Crabmancer

Other Crabs you control get +0/+1 and have "Whenever this creature is dealt combat damage,
gain 1 life."
Whenever a non Crab creature dies, you may pay {5}. If you do, create a token that's a copy of it
except it's a 0/3 Crab.
Whenever a Crab dies, each opponent loses 2 life.