Teferi's Isle
Legendary Land
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
Teferi's Isle enters tapped.
{T}: Add {U}{U}.
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Cards that do something similar expected a card that isn't here?
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Steelswarm Operator 98%
$0.24#9682
"{T}: Add {U}{U}. Spend this mana only to activate abilities of artifact sources."