アーティファクト・クリーチャー — 人間・兵士
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各ターンで対戦相手1人が初めてクリーチャーでない呪文を唱えるたび、そのプレイヤーが

を支払わないかぎり、あなたはカード1枚を引く。Xはエスパーの歩哨のパワーに等しい。
This ability checks Esper Sentinel's power when it resolves, not when the ability goes on the stack. If Esper Sentinel is no longer on the battlefield when it resolves, use the power it had the last time it was on the battlefield.
If a noncreature spell was already cast by an opponent the turn Esper Sentinel enters the battlefield, that opponent already cast their first noncreature spell this turn, and Esper Sentinel's ability won't trigger for that opponent that turn.
If Esper Sentinel's has negative power when this ability resolves, then
is
. The opponent may still choose not to pay the cost if they want you to draw a card.