Slime Dungeon

When Slime Dungeon enters the battlefield
create three 1/1 green Ooze creature tokens.
At the beginning of each end step, if Slime
Dungeon is untapped, for each ooze you control
you may pay {1}. If you do, put a +1/+1 counter
on it.
{t}: Create a 1/1 green Ooze creature token.