When Merfolk Surveyor enters the battlefield, explore-clash. If you win the explore-clash, gain 3 life. (To explore-clash, you and an opponent each reveal the top card of your respective libraries. Put any lands revealed this way into their owner's hands. Put a +1/+1 counter on this creature for each nonland card revealed this way. Then, each player who didn't get a nonland puts the card back or into their graveyard. You win the explore-clash if the mana value of your revealed card was higher.)
Near Mint - $103.80
Lightly Played - $93.50
Played - $72.70
Heavily Played - $62.30
Damaged - $51.90
Near Mint Non-English - $103.80
Lightly Played Non-English - $93.50
Played Non-English - $72.70
Heavily Played Non-English - $62.30
Damaged Non-English - $51.90