Sort by:
'Hexproof (This creature can't be the target of spells or abilities your opponents control.)
When this creature enters, put a +1/+1 counter on target Merfolk you control.
'Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
'Flash
When this creature enters, target permanent becomes the color or colors of your choice until end of turn.
'Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
'When this creature enters, create a 1/1 blue Merfolk creature token with hexproof. (It can't be the target of spells or abilities your opponents control.)
'Flash
Other Merfolk you control get +1/+1.
Sacrifice a Merfolk: Counter target noncreature spell unless its controller pays {1}.
'When this enchantment enters, you take the initiative and create a Treasure token. Whenever you attack the player who has the initiative, create a Treasure token. Loud Ruckus — Whenever...
'Flying Namor's power is equal to the number of Merfolk you control. Whenever you cast a noncreature spell with one or more blue mana symbols in its mana cost, create...
'Hexproof (This creature can't be the target of spells or abilities your opponents control.)
When this creature enters, put a +1/+1 counter on target Merfolk you control.
'Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)