Whenever a creature you control is put into a graveyard from the battlefield, you may pay . If you do, reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest into your graveyard.
Fountain of Cho enters the battlefield tapped.
: Put a storage counter on Fountain of Cho.
, Remove any number of storage counters from Fountain of Cho: Add to your mana pool for each storage counter removed this way.
At the beginning of your upkeep, each player reveals the top card of his or her library. If all cards revealed this way are creature cards, put those cards onto the battlefield under their owners' control.