Overgrown Zealot {1}{G}
Creature — Elf Druid
{T}: Add one mana of any color.
{T}: Add two mana of any one color. Spend this mana only to turn permanents face up.
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Cards that do something similar expected a card that isn't here?
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"{T}: Add two mana of any one color. Spend this mana only to activate abilities of creature sources."
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"{T}: Add two mana of any one color. Spend this mana only to cast spells from your graveyard."
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"{T}: Add two mana of any one color. Spend this mana only to cast Mount or Vehicle spells."
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"{T}: Add two mana of any one color. Spend this mana only to cast artifact spells or activate abilities of artifacts."
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"{T}: Add two mana of any one color."
+1 more matching line
Somberwald Sage 99%
$0.55#2566
"{T}: Add three mana of any one color. Spend this mana only to cast creature spells."
Glistening Sphere 99%
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"{T}: Add three mana of any one color. Activate only if an opponent has three or more poison counters."
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Sceptre of Eternal Glory 98%
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"{T}: Add three mana of any one color. Activate only if you control three or more lands with the same name."
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Pyramid of the Pantheon 98%
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"{T}: Add three mana of any one color. Activate only if there are three or more brick counters on this artifact."
+1 more matching line
Mona Lisa, Science Geek 81%
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"{T}: Add X mana of any one color, where X is this card's power."