2019-07-12 : A face-down creature has no name, so it can’t share a name with anything. This includes other creatures with no name.

2019-07-12 : If a creature on the battlefield has {X} in its mana cost, X is considered to be 0.

2019-07-12 : If the target creature is an illegal target by the time Legion’s End tries to resolve, the spell doesn’t resolve. No player reveals their hand, and nothing is exiled.

2019-07-12 : Legion’s End targets only one creature. Other creatures will be exiled even if they have hexproof, and cards in its controller’s hand and graveyard will be exiled even if that player has hexproof.

2019-07-12 : The converted mana cost of a token that isn’t a copy of another object is 0. A token that is a copy of another object has the same converted mana cost as that object.

2019-07-12 : The name of a creature token is the same as the creature types specified as it was created unless the token is a copy of another creature or the effect that created the token specifically gives it a different name.