During your turn, you may play cards you don't own with stash counters on them from exile, and mana of any type can be spent to cast those spells
A straightforward upgrade on Spark Harvest
Sure, you could ignore actual Clue tokens altogether and let Senator Peacock just convert other artifacts and artifact tokens into clues for you
Greta, Sweettooth Scourge is a flexible sacrifice outlet, while Night of the Sweets' Revenge turns your creatures into mana dorks
His deck was clearly very good, but mostly because of 4 Strip Mines, and we can only play one by Swedish rules so this deck here is nigh unplayable
The only change was that its mana cost shot up from The black creature continued to care about creatures and gained the ability to regenerate