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'Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)
'Trample
Morph {G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Strange new worlds — Reveal the top X cards of your library, where X is the number of differently named lands you control. Put all permanent cards revealed this way...
'{1}{U}: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.) Whenever one or more +1/+1 counters are put on this creature, draw...
'If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead.
'Toxic 2 (Players dealt combat damage by this creature also get two poison counters.)
'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....
'Tap an untapped Merfolk you control: Target player mills a card.
'{T}: Draw a card, then discard a card.
'{T}: Destroy target creature with islandwalk.
'Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Whenever this creature deals combat damage to a player, that player reveals a card at random...