Springleaf Drum

{T}, Tap an untapped creature you control: Add one mana of any color.

Skywatcher Adept

Level up {3} ({3}: Put a level counter on this. Level up only as a sorcery.)
LEVEL 1-2
2/2
Flying
LEVEL 3+
4/2
Flying

Caller of Gales

{1}{U}, {T}: Target creature gains flying until end of turn.

Whirlpool Rider

When Whirlpool Rider enters, shuffle the cards from your hand into your library, then draw that many cards.

Triton Shorestalker

Drowner of Secrets

Tap an untapped Merfolk you control: Target player mills a card.

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Mana Geode

When Mana Geode enters, scry 1.
{T}: Add one mana of any color.

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Stonybrook Banneret

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Merfolk spells and Wizard spells you cast cost {1} less to cast.

Drowner Initiate

Whenever a player casts a blue spell, you may pay {1}. If you do, target player mills two cards.

Ornithopter of Paradise

Merfolk Mesmerist

Merfolk Spy

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.

Tideshaper Mystic

{T}: Target land becomes the basic land type of your choice until end of turn. Activate only during your turn.

Reef Shaman

{T}: Target land becomes the basic land type of your choice until end of turn.

Bonder's Ornament

{T}: Add one mana of any color.
{4}, {T}: Each player who controls a permanent named Bonder's Ornament draws a card.

Sandbar Merfolk

Cycling {2} ({2}, Discard this card: Draw a card.)

Merrow Witsniper

When Merrow Witsniper enters, target player mills a card.

Tidal Visionary

{T}: Target creature becomes the color of your choice until end of turn.

Mist-Cloaked Herald

Universal Automaton

Changeling (This card is every creature type.)

Venture Deeper

Target player mills four cards. (Then exile this card. You may cast the creature later from exile.)

Merfolk Secretkeeper

Merfolk Secretkeeper // Venture Deeper

Dramatic Reversal

Untap all nonland permanents you control.

Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.

Merrow Levitator

{T}: Target creature gains flying until end of turn.
Whenever you cast a blue spell, you may untap Merrow Levitator.

Archaeomancer

When Archaeomancer enters, return target instant or sorcery card from your graveyard to your hand.

Darksteel Ingot

Indestructible (Effects that say "destroy" don't destroy this artifact.)
{T}: Add one mana of any color.

Manta Riders

{U}: Manta Riders gains flying until end of turn.

Merfolk Thaumaturgist

{T}: Switch target creature's power and toughness until end of turn.

High Tide

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

Rootwater Mystic

{1}{U}: Look at the top card of target player's library.

Merfolk Looter

Silvergill Douser

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

Letter of Acceptance

{T}: Add one mana of any color.
{2}, {T}, Sacrifice Letter of Acceptance: Draw a card.

Peregrine Drake

Flying
When Peregrine Drake enters, untap up to five lands.

Triton Shorethief

Merfolk of the Pearl Trident

Tidal Warrior

{T}: Target land becomes an Island until end of turn.

Ink Dissolver

Kinship — At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with Ink Dissolver, you may reveal it. If you do, each opponent mills three cards.