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He can send any card to GY in a Deck with Fusion Monsters with loose fusion materials, such as FGD and attribute E HERO, so it is a very powerful card

The Account Mastery which is a one time track you go through and earn rewards in, this is also known as the New Player Experience

Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Notes and Rules Information for King of the Oathbreakers: If a spell an opponent controls targets multiple Spirits you control, King of the Oathbreakers's triggered ability will trigger once for each of those Spirits

And since its a Trap, you can do this on your opponents turn to summon some negation they didnt count on