At the beginning of combat on your turn, Deepfathom Echo explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)
Near Mint - $800
Lightly Played - $600
Moderately Played - $600
Heavily Played - $500
Damaged - $400
Near Mint Spanish - $800
Lightly Played Spanish - $600
Moderately Played Spanish - $600
Heavily Played Spanish - $500
Damaged Spanish - $400
Foil Prices
Near Mint Foil - $900
Lightly Played Foil - $700
Moderately Played Foil - $600
Heavily Played Foil - $600
Damaged Foil - $500
Near Mint Foil Spanish - $900
Lightly Played Foil Spanish - $700
Moderately Played Foil Spanish - $600
Heavily Played Foil Spanish - $600
Damaged Foil Spanish - $500