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From $2.25
'Whenever this creature becomes tapped, you may create a 1/1 blue Merfolk Wizard creature token.
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}.
From $5.00
'Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) When Emry enters, mill four cards. {T}: Choose target artifact card in your graveyard. You...
From $0.50
Exhaust — {X}{U}{U}, {T}: Draw X cards. Put a +1/+1 counter on each Merfolk creature you control. (Activate each exhaust ability only once.)
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 $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.
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 $1.50
'Other Merfolk creatures you control get +1/+1.
{T}: Target Merfolk creature can't be blocked this turn.