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Hexproof
As long as Siege Behemoth is attacking, for each creature you control, you may have that creature assign its combat damage as though it weren't blocked.
You decide whether to assign a creature’s combat damage as though it weren’t blocked just before it assigns that damage. You may make a different choice for each creature you control—that is, you may have none, some, or all of those creatures assign combat damage as though they weren’t blocked.
