こうして終わりを迎える

クリーチャー１体を対象とする。それのオーナーはそれを自分のライブラリーに加えて切り直し、その後「そのプレイヤーは５点のライフを失う。」か、「そのプレイヤーがオーナーでありこれでないクリーチャー１体を自分のライブラリーに加えて切り直す。」かの最悪の二択を行う。

This Is How It Ends

Target creature's owner shuffles it into their library, then faces a villainous choice — They lose 5 life, or they shuffle another creature they own into their library.

Doctor Who

A player facing a villainous choice can always choose either option, even if one or both of the options are impossible. For example, if one of the options is to sacrifice a creature, a player who controls no creatures can still choose that option.

If a spell or ability requires multiple players to face a villainous choice, the result is a little different from other effects in Magic. In that case, the first player in turn order makes their choice and the action for that choice is performed before the next player makes their choice. Then each of the remaining players repeat this process in turn order.

When a player faces a villainous choice, they first choose one of the two options, then all actions in the chosen option are performed.