How many combo pieces
Gavi lets you pay zero instead of the cost of the first card you cycle on a turn, and then whenever you draw your second card for the turn, you create a 2/2 Dinosaur Cat creature token
While he is a little expensive to cast in a pure aggro deck, it isnt the worst and has enough of an upside that hell probably be a solid choice to run in a deck
One other card is from the Blind Eternities, and so its Booster Fun treatment is borderless rather than planar
Breeches, the Blastmaker Breeches, the Blastmaker gives the gambling soul a crack at copying spells
Almost every Ragavan, Nimble Pilferer deck plays the two-mana sorcery alongside it, as the more mana you can create, the better Iteration is as it is not being forced to take lands from it/having the mana to be able to cast any card you hit makes Iteration closer to a two-mana spell that draws two of the top three cards, which is utterly broken