The Gang provide some well needed juice to power up squirrels as well as what could be a very powerful card draw engine with the right set up, with their ability allowing a draw when a squirrel does combat damage

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You have to choose a nonland permanent, which means thats on the board somewhere - you cant just name any card in MTGs history like with Pithing Needle or Sorcerous Spyglass, though those dont stop mana abilities, which Scheming Fence does
Bargain itself seems at first blush like a small drawback kind of mechanic where you trade something you have for some extra power