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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.)
'Flying
Whenever you cast a kicked spell, scry 2.
'{U}: This creature gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)
'When this creature dies, you may pay {1}{U}. If you do, draw a card.
'Islandwalk (This creature can't be blocked as long as defending player controls an Island.) When this creature enters, you may search your library for a Merfolk card, reveal it, then...
'This creature can't be blocked.
'{T}: Target player exiles a card from their graveyard.
Whenever you cast a black spell, you may untap this creature.
'This creature can't be blocked.
Flash
When this creature enters, untap each other Merfolk you control.
As long as you attacked with three or more Merfolk this turn, Merfolk you control get +1/+0.
'This creature can't be blocked.