At the beginning of your upkeep, Sea Depths deals 2 damage to target creature you control.
: Add to your mana pool. Return Sea Depths to its owner's hand.
: Sea Depths becomes a 2/1 blue and black Fish creature until end of turn. It's still a land.
: Add 
to your mana pool. Return Sea Depths to its owner's hand.: Sea Depths becomes a 2/1 blue and black Fish creature until end of turn. It's still a land.
