パーセプションのボブルヘッド {3}

アーティファクト — ボブルヘッド

{T}：好きな色１色のマナ１点を加える。

{3}, {T}：あなたのライブラリーの一番上にあるカードＸ枚を見る。Ｘは、あなたがコントロールしているボブルヘッドの数に等しい。その中からマナ総量が３以下である呪文１つを、マナ・コストを支払うことなく唱えてもよい。残りをあなたのライブラリーの一番下に無作為の順番で置く。

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Fallout #139

Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
The value of X is determined only once, as Perception Bobblehead’s last ability resolves. (2024-03-08)
You choose whether to cast a spell from among the cards you’re looking at as Perception Bobblehead’s last ability resolves. You can’t wait to cast one later in the turn. Timing restrictions based on the card’s types are ignored. (2024-03-08)

If you cast a spell “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell. (2024-03-08)
If a spell you cast has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost. (2024-03-08)