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From $6.00
'{T}: Add {C}.
{T}: Add {W}. Activate only if you control an Island.
{T}: Add {U}. Activate only if you control a Plains.
From $16.75
'Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)
From $15.00
'{T}: Add {W}.
{T}: Add {U}. Activate only if you control a Plains or an Island.
From $5.00
'If this land would enter, sacrifice an untapped Island instead. If you do, put this land onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add...
From $10.50
'At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X...
From $3.25
'This land enters tapped unless you control a Forest or an Island.
{T}: Add {G} or {U}.
$0.25
'{T}: Add {C}.
{1}, {T}, Sacrifice this land: Search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle.
From $37.25
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle.
From $8.75
'{T}: Add {U}.
{T}: Add {B}. Activate only if you control an Island or a Swamp.
$0.25
'Affinity for Islands (This spell costs {1} less to cast for each Island you control.)
Flying
From $1.25
'Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.