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From $0.75
'As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}.
When this creature enters, draw a card.
From $4.25
'Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.
From $1.50
'Whenever your opponents are dealt combat damage, if any of that damage was dealt by a Warrior, you draw a card and you lose 1 life.
From $10.25
'Champion a Merfolk (When this enters, sacrifice it unless you exile another Merfolk you control. When this leaves the battlefield, that card returns to the battlefield.) Whenever this creature deals...
From $100.25
'When this creature enters, look at the top X cards of your library, where X is your devotion to blue. Put up to one of them on top of your...
From $12.50
'At the beginning of combat on your turn, each Merfolk creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a...
From $15.50
'Whenever a permanent becomes untapped, that permanent's controller mills a card.
From $9.50
'[+2]: Up to one target legendary creature gains vigilance, lifelink, and indestructible until your next turn. [−3]: Reveal the top four cards of your library. Put any number of legendary...
From $1.50
'Vigilance This creature can't be blocked by creatures with power 2 or greater. Whenever this creature attacks, up to one target artifact, creature, or planeswalker an opponent controls loses all...
From $2.75
'Protection from red Elemental creatures you control get +1/+1. When this creature enters, create a number of 1/0 blue Elemental creature tokens equal to your devotion to blue. (Each {U}...
From $6.50
'Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)