危険因子
インスタント
対戦相手１人を対象とする。そのプレイヤーは「危険因子はそのプレイヤーに４点のダメージを与える。」を選んでもよい。そのプレイヤーがそうしなかったなら、あなたはカードを３枚引く。
再活（あなたはあなたの墓地から、このカードを、これの他のコストの支払いに加えてカード１枚を捨てることで唱えてもよい。その後、このカードを追放する。）
Illustrated by
Guilds of Ravnica#113RareJapaneseLegality
Rulings
If the target player is an illegal target by the time Risk Factor tries to resolve, the spell doesn’t resolve. You don’t draw three cards.
You must still follow any timing restrictions and permissions, including those based on the card’s type. For instance, you can cast a sorcery using jump-start only when you could normally cast a sorcery.
A spell cast using jump-start will always be exiled afterward, whether it resolves, it’s countered, or it leaves the stack in some other way.
If an effect allows you to pay an alternative cost rather than a spell’s mana cost, you may pay that alternative cost when you jump-start a spell. You’ll still discard a card as an additional cost to cast it.
If a card with jump-start is put into your graveyard during your turn, you’ll be able to cast it right away if it’s legal to do so, before an opponent can take any actions.