Eahnah in the Tropics

Eahnah in the Tropics can't be countered.
At the beginning of your upkeep, each player puts the top card of his or her library into his or her graveyard.
Whenever a player puts a card into his or her graveyard from his or her library, Eahnah in the Tropics gets +1/+1 until end of turn.