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$0.25
'Affinity for Islands (This spell costs {1} less to cast for each Island you control.)
Flying
$0.25
'Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{1}, {T}: Tap target land.
From $1.25
'Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.
From $68.25
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Island card, put it onto the battlefield, then shuffle.
$0.25
'This land enters tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.
From $0.25
'This land enters tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.
From $0.25
'This land enters tapped unless you control a Plains or an Island.
{T}: Add {W} or {U}.
From $7.00
'Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)
$0.25
'({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.
From $2.00
'({T}: Add {W} or {U}.)
This land enters tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)
From $9.50
'({T}: Add {U} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $0.50
'This land enters tapped unless you control an Island.
{T}: Add {U}.
{2}{U}{U}, {T}: Scry 2.