Enchanted Cavern

{t} add {g/u} to your mana pool
Enchanted Cavern enters the battlefield
with 5 time counters on it. at the beginning
of your upkeep, remove a time counter from it.
When Enchanted Cavern has 0 time
counters on it, sacrifice it.
When Enchanted Cavern enters and leaves the battlefield create a blue
1/2 Landfish creature token