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Its effect as a pendulum monster is that it allows you to pay thousand life points to add an Abyss Actor monster from your Deck to your hand, but it cannot be another Mellow Madonna

Then you essentially do this on repeat to consistently make us of your Prank-Kids abilities

A friend of mine recently bought a DM2 Blue-Eyes Ultimate Dragon reaching over 250k usd (cos it was the replica version) and the non replica was for sale in Japan for 450k usd (never sold but its a reference)

it's just a reusable counterspell

Overall, this boss monster defined a format, and the fact that it was unbanned shows that Yu-Gi-Oh

For more guidance on avoiding counterfeits, read our guide to identifying fake Pokmon cards