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however, the deck can be hated out with proper graveyard hate or throwing a lot of removal spells at the Frog Horror itself

You could also word it so that it works only if your monster is currently battling another monster so it doesn't become a potential "burn for 700 for game" card (which Kalut is infamous for)

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Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Barret, Avalanche Leader: You can't use Barret's last ability to try to attach an Equipment to a Rebel if that Equipment can't legally be attached to that Rebel

Being a hybrid card also makes it a more diverse combo piece