Slime Mranilac

All other creature you control have propagate. (You may exile the creature from the stack and create X 1/1 artifact assemblage tokens where X is the creature's power. Designate one of those tokens to have the abilities of the exiled creature.)
Assemblage creatures you control have +1/+1.
Whenever an assemblage you control dies, put a +1/+1 counter on another assemblage creature