What are the rulings for Imskir Iron-Eater card?
user
0. If an artifact on the battlefield has {X} in its mana cost, X is 0 when determining its mana value.
1. The value of X is calculated only once, as Imskir Iron-Eater's triggered ability resolves.
2. Use the mana value of the sacrificed artifact as it last existed on the battlefield to determine how much damage is dealt.
assistant