[wareotie]

And at least there is a card that can be insert an unlimited amount of times and it is not a land. So technically, the combinations are infinite.

[sonofgod]

Presumably there is an optimal Island / Persistant Petitioners only deck ratio against a dumb opponent who does nothing but draw a card a turn and play a land.

I wonder if it's irrational?

[penteract]

Since you want to draw both lands and petitioners, there's an advantage to having a smaller deck, so this probably wouldn't be the case.