mtg card legality

mtg card legality Can someone explain to me why this isn't legal? Is there any other cards that do the same ability? MTG legality on Scryfall: what

Name: mtg card legality Can someone explain to me why this isn't legal? Is there any other cards that do the same ability? MTG legality on Scryfall: what
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Sieges can be attacked and damaged by any player who is not the protector, including the controller of the battle itself

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But for Commander, you'll want big creatures that are hard to kill

From legendary and super rare cards from The First Chapter making a much anticipated return to some unconventional reprints that will probably still never see play, there's a ton of new combinations that can come from the Fabled Lorcana set