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The absolute worst it can do is special summon another monster from the grave, but at best Chaos Dragon Levianeer is capable of destroying two cards on the field

This sort of move, when done several times, can prevent your opponent from doing anything at all the rest of the match

And after that battle, the credits music starts and we're shown not only every card we have, but how many times it KO'd something or was KO'd, and the maximum amount of damage each of its three attacks we've done with them

If anything, I think the history of things like phyrexian mana shows that Wizards does learn from their design mistakes