Diaper bucket

Give Diaper bucket to target player.

Put a poop diaper counter on Diaper bucket
for every sacrificed poop diaper.

At the end of the Diaper bucket owner’s turn,
the owner of diaper bucket get X damage,
where X is the amount of sacrificed poop diapers.

Sacrifice target creature you control or pay 4 life :
put Diaper bucket in its original owner's graveyard.