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From $9.25
'Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)
From $4.50
'As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped.
{T}: Add {W} or {U}.
$0.25
'Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If...
From $19.50
'Changeling (This card is every creature type.) As this creature enters, choose a creature type. You may look at the top card of your library any time. You may cast...
From $1.25
Changeling (This card is every creature type.) As this creature enters, choose a creature type. You may look at the top card of your library any time. You may cast...
From $2.25
'Whenever this creature becomes tapped, you may create a 1/1 blue Merfolk Wizard creature token.
From $0.50
'Create two 1/1 blue Merfolk Wizard creature tokens.
Tap four untapped Merfolk you control: Return this card from your graveyard to your hand.
From $3.25
'If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead.