Lord of Atlantis

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Merfolk of the Pearl Trident

Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

Unsummon

Return target creature to its owner's hand.

Ornithopter

Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

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