If I have Mana Reflection in play and tap Doubling Cube, what happens? I know that Doubling Cube's ability is a mana ability. So is the mana in the mana pool essentially triplicated because of Mana Reflection? For example, if I have 5 in the mana pool, Doubling Cube would technically add 10 due to Mana Reflection and I'd have 15 total afterwards?
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In general, this combo triples the amount of each type of unspent mana you have. For example, if you have CCCCC (not: 5 [C.R. 107.4b-c]) in unspent mana, you add five additional colorless mana, and Mana Reflection doubles that to ten additional colorless mana, for a total of fifteen colorless mana. However, the additional mana added this way won't have any restrictions or additional effects on that mana (for example, those found in Food Chain or Boseiju, Who Shelters All), because Doubling Cube's ability—
has you "ad[d] an amount of mana of [each] type equal to the amount [you] already have" without regard to any restrictions or other effects on that mana (C.R. 701.9f), and
doesn't impose any restrictions or other effects of its own on the mana you add this way.
(Note that cards no longer speak of a "mana pool"; see, for example, Doubling Cube's current Oracle text [C.R. 108.1].)
EDIT: Correction and rule citations added after comment 3 was posted.
EDIT (Jun. 15, 2021): Clarification.
EDIT (Mar. 31, 2022): Edited in view of updated Oracle text on Doubling Cube.
EDIT (Apr. 13, 2022): Edited.
BGU [Primer] Sidisi, Brood Tyrant BGU | BG [Primer] Mazirek, Kraul Death Priest BG | G [Primer] Polukranos, World Eater G
My YouTube Channel:
The Commander Tavern - a channel I just started where I'll post deck techs and gameplays. Please support by checking it out. Maybe you'll like its content and subscribe! Thanks!
EDIT: Correction and rule citations added after comment 3 was posted.
EDIT (Jun. 15, 2021): Clarification.
EDIT (Mar. 31, 2022): Edited in view of updated Oracle text on Doubling Cube.
EDIT (Apr. 13, 2022): Edited.
Two Score, Minus Two or: A Stargate Tail
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