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Protection from red Sacrifice Burrenton Forge-Tender: Prevent all damage a red source of your choice would deal this turn.

Create two 1/1 blue Merfolk Wizard creature tokens. Tap four untapped Merfolk you control: Return Summon the School from your graveyard to your hand.

When Hearthcage Giant enters the battlefield, create two 3/1 red Elemental Shaman creature tokens. Sacrifice an Elemental: Target Giant creature ge...

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

{W}, {T}: Harpoon Sniper deals X damage to target attacking or blocking creature, where X is the number of Merfolk you control.

{2}{B}: Regenerate target Treefolk.

Flying

This creature's power and toughness are each equal to your life total.

Other Merfolk creatures you control get +1/+1. Whenever you cast a Merfolk spell, you may tap or untap target permanent.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.) When Merrow Harbinger enters the battlefield, you may ...

Champion a Merfolk (When this enters the battlefield, sacrifice it unless you exile another Merfolk you control. When this leaves the battlefield, ...

Changeling (This card is every creature type.) {1}{U}: Switch Turtleshell Changeling's power and toughness until end of turn.

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

Whenever Surgespanner becomes tapped, you may pay {1}{U}. If you do, return target permanent to its owner's hand.

{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island...

Enchant creature Enchanted creature has defender and flying.

Changeling (This card is every creature type.) Until end of turn, target creature has base power and toughness 4/4, gains all creature types, and g...