This magnificent loop turns a massive investment into total board dominance by cycling Doppelgang alongside an army of Eternal Witness tokens. When the Doppelgang tokens flood the battlefield, their entry triggers allow you to scoop Doppelgang right back out of your graveyard along with any other resources you need. By pairing this recursion with enough mana-producing permanents, you can recast the spell with an even larger value for $X$, rapidly scaling your output until you can duplicate every single permanent on your side of the table.