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Battle Screech somehow fits most of these categories, but lets analyze other options

Retrieved April 18, 2009

In the era of the Clone Wars, Jedi like Obi-Wan Kenobi fought against the darkness of the Separatist army, Jyn Erso and Luke Skywalker led a tiny band of Rebels against a Galactic Empire, and when the First Order rose to power the Resistance stood up as the spark of hope that would burn it down

Even just one copy of this card can do plenty of damage in a format where the person who goes first will likely use plenty of cards from their deck, making it significantly smaller

Toxic Deluge Toxic Deluge fits the bill of a cheaper and more flexible/effective sweeper

This set in particular has a focus on upgrading existing basic cards with newer versions that cost XP to add