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You can always swap decks to try out different strategies, and treat these as a base for building on

Coststorm (When you cast this spell, copy it for each different mana value among other spells and lands you've played this turn.) The copies of Friarball created by its coststorm ability are put directly onto the stack

It can shuffle up to 4200 decks of cards after a full charge

I thought about going with Dragons and using the two megamorph dragons that put +1/+1 counters on all of my other Dragons when they are turned face up, but both the Blue and Green ones are just 4/4s

In theory, we can double up counters with Maulfist Revolutionary or Quarry Hauler, but that's a lot of work to make Imminent Doom deal two damage instead of one, or four damage instead of two, and we'd still need to cast a spell with the right converted mana cost to trigger it