Flying
Islandcycling

When Shoreline Scout enters, you may exile a Merfolk card or a land card from your hand. If you do, conjure a Tropical Island card into your hand.
As long as another Merfolk or an Island entered the battlefield under your control this turn, Shoreline Scout gets +1/+0.

Whenever this creature deals combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)

Flying
Whenever this creature deals combat damage to a player, that player mills two cards.

Flying
When this creature enters, return a creature you control to its owner's hand.

Whenever this creature attacks, defending player may pay . If that player doesn't, this creature can't be blocked this turn.

Prowess
Whenever you cast a noncreature spell, you may pay . If you do, target creature gains double strike until end of turn.

Artifact spells you cast cost less to cast.
, : Target artifact you control becomes a copy of a second target artifact you control until end of turn, except it isn't legendary. Activate only as a sorcery.

At the beginning of your upkeep, you may have this creature become the color or colors of your choice. (This effect lasts indefinitely.)

Flying
Whenever Siani attacks, scry X, where X is the number of attacking creatures with flying.
Partner

Flying
Whenever this creature attacks, defending player may draw a card.

When this creature enters, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.

Exploit
When this creature exploits a creature, return target creature to its owner's hand.

, Tap two untapped Wizards you control: Copy target instant or sorcery spell. You may choose new targets for the copy.

: Scry 1.

This creature can't attack unless you've cast a noncreature spell this turn.

Flying
, Sacrifice this creature: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Flash
Flying
Exploit
When this creature exploits a creature, counter target creature spell.

Megamorph
When this creature is turned face up, counter target spell unless its controller pays .

Flying, trample

Flash
Flying
When Silver Surfer enters, exile any number of other target permanents you control. Return those cards to the battlefield under their owner's control at the beginning of the next end step. If a land enters this way, it enters tapped.

Flying
: Change the target of target spell or ability that targets only this creature. The new target must be a creature.

As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay .
When this creature enters, draw a card.

: Target creature gets -X/-0 until end of turn, where X is the number of Merfolk and/or Faeries you control.

As an additional cost to cast this spell, behold a Merfolk or pay .
When this creature enters, create a 1/1 white and blue Merfolk creature token.

Whenever this creature becomes tapped, draw a card, then discard a card.

Evolve
, : Move a +1/+1 counter from this creature onto target creature.

Evolve
, Remove one or more +1/+1 counters from this creature: Gain control of target creature with power less than or equal to the number of +1/+1 counters removed this way.