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あなたの各ターン中に1回、あなたの墓地からアーティファクト・呪文1つを唱えてもよい。これによりあなたが呪文を唱えたなら、そのアーティファクトはタップ状態で戦場に出る。
きかい ― これが攻撃するたび、ターン終了時まで、これは+X/+0の修整を受ける。Xは、あなたがコントロールしているアーティファクトのマナ総量の中の最大値に等しい。
If an artifact you control has
in its mana cost, X is 0 for the purpose of calculating its mana value.
The value of X is calculated only once, as Edgar's last ability resolves.
Edgar must be under your control in order to start casting an artifact spell using its first ability, but it doesn't need to stay under your control throughout that process or be under your control as the spell resolves. If, for example, you sacrifice Edgar to pay an additional cost of the spell or Edgar is destroyed in response, the spell will still resolve normally.
You must still pay all costs and follow any timing restrictions and permissions for artifact spells you cast from your graveyard this way. Normally, you'll be able to cast them only during your main phase while the stack is empty.