Here, since you have to tap to use it, and you only have 6 uses, I like it with haste in Red or equipment, untaps or haste like Thousand-Year Elixir and then after it's done, a blink effect like Momentary Blink
It also gives all of your creatures an ability that makes it so that they get +1/+1 counters on them whenever they activate a mana ability, equal to the amount of mana they created with that ability
SIRs are a subset of that at lower rates
If I draw one of the significant upgrades, like Anointed Procession, that I added to the deck, preconstructed decks generally wont be able to stand up to it (as long as they dont remove it immediately)
Once more information becomes available I'll make sure to let you know, but until then at least we'll have the upcoming friend challenge system to keep us busy.