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Were not telling, but we will tell you that having him around can turn even the most specialized squadron of Six Samurai into massive wrecking balls, during either players turn
Add to your hand, or place face-up in your Field Zone, 1 Malefic World from your Deck or GY, then Special Summon 1 Malefic monster from your Deck or Extra Deck in Defense Position, ignoring its Summoning conditions, then if your opponent controls a monster with 2500 or more ATK, all face-up monsters they currently control lose 2500 ATK until the end of this turn
His first ability lets him deal three damage to any target, including killing off your opponent if needed
If the target creature is an illegal target by the time Blood Curdle tries to resolve, the spell won't resolve