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Add in a Haste enabler like Concordant Crossroads or use a card like Earthcraft that entirely bypasses Summoning Sickness, and Squirrel Girl can start looping into infinite mana and infinite Squirrel tokens

You're hard to answer, not impossible

It creates six of them each time it deals damage (or more with pump spells), but you can also use its activated ability to create extra tokens when you ping things with it

Enter the God-Eternals Compare: Bituminous Blast could Cascade into another Cascade card (say a Bloodbraid Elf) or another card advantage card (say a Blightning), sure

It completely skips your draw step and lets you pay one life to draw a card whenever you want