wotc
You can activate Prismatic Geoscope's mana ability if you have no basic land types among lands you control, but it won't produce any mana.
MTG · Card
◇ Catalog #71
Prismatic Geoscope
DIGITAL ONLY
pz2·#71·rare·nonfoil
Illus. Steven Belledin
—
in vault
—
for trade
—
wishlisted
Nov '16
9 yr ago
Played in EDH
EDHrec rank #16,255 · Fringe play
Variants
Gameplay
Artifact
This artifact enters tapped.
Domain — {T}: Add X mana in any combination of colors, where X is the number of basic land types among lands you control.
Legalities
tlrnot legal
duellegal
brawlnot legal
pennynot legal
PreDHnot legal
Rulings · 7
wotc
The colors of mana that Prismatic Geoscope can produce aren't related to the specific basic land types among lands you control. For example, if you control a Plains and an Island, you can activate Prismatic Geoscope's ability to add {R}{G}.
wotc
To determine the number of basic land types among lands you control, look for the Plains, Island, Swamp, Mountain, and Forest subtypes among the lands you control. Count each subtype that appears one or more times toward the number of basic land types among lands you control. This number can't exceed five.
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Steven Belledin
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
SourcesScryfall