Venat, Heart of Hydaelyn // Hydaelyn, the Mothercrystal
Legendary Creature — Elder Wizard // Legendary Creature — God
Rulings (9)
The back face of a nonmodal double-faced card usually has a color indicator that defines its color.
A token that is created as a copy of a double-faced permanent or a double-faced card in another zone is a double-faced token. It will have both the front face and back face of whatever object it's copying. If it's copying a double-faced permanent whose back face is up, the token will enter with its back face up. It can transform if instructed to do so.
If the target creature is an illegal target as Hydaelyn, the Mothercrystal's last ability tries to resolve, it won't resolve and none of its effects will happen. You won't draw a card even if that creature is legendary.
Legality
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