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C Common Evil HERO Sinister Necrom X DARK Level 5 [ FiendEffect ] ATK 1600 DEF 1800 You can banish this card from your GY

I know a lot of folk are discussing its potential in Standard or Modern or whatnot

If something looks troublesome, destroy it with Mind Crush

However, Sign in Blood gives you the ability to target a player other than yourself, meaning if a player is down to 2 life or less, you can actually use it to win the game

Compared to cards like Gaia Force, there is an argument that Iron-Fisted Onslaught is better since, although situational, it can wipe out your opponent's entire board