Its casting trigger exiles the top half of an opponents library, quite literally, cutting half their cards out of the game
And that's not taking into account the decks that thrive on having their graveyards filled
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for The Final Days: "Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." (2025-06-06) You must still follow any timing restrictions and permissions, including those based on the card's type
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On the one hand, its removing small (power 3 or less) creatures, and on the other its removing an artifact or enchantment
You'll want to prioritize powerful, must-answer threats to put pressure on your opponents