Something's in the Water

Cursebond (This creature has "enchant player" and enters the battlefield under the control of that player. It can't be sacrificed.)
Creatures you control get +X/+X, where X is the number of non-energy counters you have.
When Something's in the Water enters or leaves the battlefield, you get a poison counter and an experience counter, and up to two target creatures each get a counter of any type.