Okay so a recent game i played has a situation i never came across before come up. It was regarding Mirari's wake. This cad has never once posed a rules question for me since it is pretty clear. However, while using teh ability to cast my The Ur-Dragon for WUBRG using Fist of Suns I only tapped 3 lands. Scrubland, Volcanic Island and Tropical Island
They all produce 2 so i just tapped them all for 2 and have an extra blue from one of them.
the issue is that Mirari's wake says any type of mana that land produced, not can produce. So would that mean I would have to use 5 lands to produce all 5 colors
With Mirari's Wake, whenever you tap a land for mana, you choose one type of mana produced this way, and you add one additional mana of that type. For example, if you control one Mirari's Wake—
and tap a land for U, you add an additional U for a total of UU.
and tap a Volcanic Island for mana, you add either UU or RR (not UR).
Thus, in this scenario, you can't tap just Scrubland, Volcanic Island, and Tropical Island to produce WUBRG (none of these three lands produces two mana, but rather one mana corresponding to one of its basic land types; you can activate only one of its corresponding mana abilities at a time, not both [C.R. 602.2a, 305.6; see also C.R. 117.10]).
EDIT (Apr. 27, 2018): Edited due to convention started with Dominaria.
EDIT (May 13, 2018): Better rule citations.
With Mirari's Wake, whenever you tap a land for mana, you choose one type of mana produced this way, and you add one additional mana of that type to your mana pool. For example, if you control one Mirari's Wake—
and tap a land for U, you add an additional U to your mana pool for a total of UU.
and tap a Volcanic Island for mana, you add either UU or RR (not UR) to your mana pool.
and tap a Rakdos Carnarium for mana, you add either BBR or BRR to your mana pool.
Thus, in this scenario, you can't tap just Scrubland, Volcanic Island, and Tropical Island to produce WUBRG (none of these three lands produces two mana, but rather one mana corresponding to each of its basic land types; you can activate only one of its corresponding mana abilities at a time, not both [C.R. 117.10, 305.6]).
Replacing Mirari's Wake with Mana Reflection, the same result generally occurs in the case of lands that would otherwise produce one mana when tapped for mana. However, in the case of lands that would otherwise produce more than one mana when tapped for mana, they "produc[e] twice as much of that mana instead". For example, if you tap Rakdos Carnarium for mana, it produces BBRR instead of BR.
Note, however, that unlike Mirari's Wake, Mana Reflection changes the amount of mana a land produces (it uses a replacement effect instead of a triggered ability [compare C.R. 614.1a with C.R. 603.1, respectively]).
Therefore, if you control Mana Reflection instead of Mirari's Wake in the scenario in comment 1, you still can't tap just Scrubland, Volcanic Island, and Tropical Island to produce WUBRG.
They all produce 2 so i just tapped them all for 2 and have an extra blue from one of them.
the issue is that Mirari's wake says any type of mana that land produced, not can produce. So would that mean I would have to use 5 lands to produce all 5 colors
UB Vela the Night-Clad BUDecklist
WBG Ghave, Guru of Spores GBW
WUBRGThe Ur-DragonWUBRGDecklist
EDIT (Apr. 27, 2018): Edited due to convention started with Dominaria.
EDIT (May 13, 2018): Better rule citations.
okay so is that the same for Mana reflection?
UB Vela the Night-Clad BUDecklist
WBG Ghave, Guru of Spores GBW
WUBRGThe Ur-DragonWUBRGDecklist
Note, however, that unlike Mirari's Wake, Mana Reflection changes the amount of mana a land produces (it uses a replacement effect instead of a triggered ability [compare C.R. 614.1a with C.R. 603.1, respectively]).
Therefore, if you control Mana Reflection instead of Mirari's Wake in the scenario in comment 1, you still can't tap just Scrubland, Volcanic Island, and Tropical Island to produce WUBRG.
EDIT (Nov. 8): Correctness edit.
EDIT (Jul. 7, 2020; Aug. 26, 2020): Edited.