I feel like there's some sort of combo that involves Roon of the Hidden Realm, Elvish Archdruid a haste enabler and this that ends up being the takeaway from the whole set. But, then again, Elfball probably should already be Acorn.
You start with 7 mana in your mana pool. You tap Sole Performer for tt. You spend 3, t on Doubling Cube's ability. You go down to 4 mana and t at this point. After Doubling Cube's ability resolves, you now have 8 mana and tt in your mana pool. Repeat for infinite mana.
You start with 7 mana in your mana pool. You tap Sole Performer for tt. You spend 3, t on Doubling Cube's ability. You go down to 4 mana and t at this point. After Doubling Cube's ability resolves, you now have 8 mana and tt in your mana pool. Repeat for infinite mana.
In a regular set, this would say "T: Untap up to two permanents." In an Un-set, we take tapping as a cost very literally.
Source: @mtgjp
Also works great with Time Vault.
Leyline of a Fun Dance 2GG
Enchantment
If Leyline of a Fun Dance is in your opening hand, you may begin the game with it on the battlefield.
Whenever you tap a creature for one or more T, add an additional T.
6GG: Spells you cast this turn have convoke.
I just want to hear that there's no burn involved. Claiming people's soles is Shiv's thing and therefore belongs into Dominaria sets only.
Which would in theory mean...
Nono, it adds tap.
You start with 7 mana in your mana pool. You tap Sole Performer for tt. You spend 3, t on Doubling Cube's ability. You go down to 4 mana and t at this point. After Doubling Cube's ability resolves, you now have 8 mana and tt in your mana pool. Repeat for infinite mana.
But it doesn't add mana, it adds tap!
That tap is not mana is both confirmed by MaRo and implicit in the way Training Grounds functions.