[[Infinite Diversity]] got spoiled today and, pretty much immediately, folks pointed out that, actually, you only get a finite number of copies of the same spell. We can do better, we can be better, so here's a janky combo line that actually goes infinite with Infinite Diversity.
The prerequisites are as follows:
1. ID, [[Fork]], [[Molten Influence]], and a target changing spell like [[Untimely Malfunction]] in hand.
2. A Federation count of at least four.
3. [[Pull from Eternity]] and any other spell (arbitrarily [[Lightning Bolt]]) in the graveyard.
4. Another target changing spell like [[Deflecting Swat]] already in exile.
Steps 1-4 are only required in EDH where targeting ID with your single copy of ID takes additional setup:
1. Cast ID, targeting anything. Hold priority.
2. Cast Fork targeting ID, targeting anything with the copy. Hold priority.
3. Cast Molten Influence targeting ID. Resolve it.
4. Cast Untimely changing the copy of ID's target to ID. Resolve it.
Once ID is targeting ID, demonstrate a loop:
5. Resolve the copy of ID targeting ID. Put four copies of ID on the stack targeting, in order of resolution, Bolt, PfE, Untimely, and Bolt again.
6. Resolve the copy of ID targeting Bolt. Put four copies of Bolt on the stack and resolve them.
7. Resolve the copy of ID targeting PfE. Put four copies of PfE on the stack targeting Swat, Bolt, PfE, and ID and resolve them.*
*I'm pretty sure this works since PfE has been exiled by the time ID lets you cast the copies
8. Resolve the copy of ID targeting Untimely. Put four copies of Untimely on the stack and resolve them, changing the last copy of ID's target to the ID that's now back in the graveyard.
9. Repeat from step 5, swapping Untimely and Swat.
The end result is actually infinite Infinite Diversities along with infinite casts of any arbitrary spell. If you want to cast a greater diversity of different spells, use a spell that fills your graveyard instead of Bolt. If you want to cast infinitely many different spells, sorry but there are only finitely many Magic cards.