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From that, you can pretty plainly see the strategy of this deck: swarm the battlefield with lots of creatures, and augment them with +1/+1 counters

This is a non-rotating format that goes back to about 2012, which makes it very similar to Pioneer or Modern

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Fortunately, weve seen a few others even within CMM

Otherwise, you will simply resolve your spell as if nothing happened (to be clear, you will still get your original copy of the Demonstrated spell)

Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard