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So this card alone can put an end to many games as quickly as they start

Deus ex Machina: The Majestic Dragons (Yusei's Majestic Star Dragon and Jack's Majestic Red Dragon.) Mainly because they require a specific Tuner monster (Majestic Dragon) which the Crimson Dragon can add on top of a Signer's deck at its discretion

One-sided cheap board clears are tricky to find, but options like Crippling Fear can make for a reasonable budget replacement

your opponent looks at their Deck, reveals 1 of the declared monsters if there is any, and chooses 1 of these effects to be applied

In Magic, a mana value of 1 million basically means you need access to infinite mana