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:あなたがコントロールしていてこれでないクリーチャー1体を対象とする。ターン終了時まで、それは飛行と絆魂を得る。
あなたの終了ステップの開始時に、このターンにあなたがライフを得ていた場合、土地でないカード1枚が追放されるまで、あなたのライブラリーの一番上から1枚ずつ追放していく。その呪文のマナ総量が、あなたがこのターンに得たライフの合計以下であるなら、そのカードをマナ・コストを支払うことなく唱えてもよい。そうでないなら、それをあなたの手札に加える。
If the spell you cast has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
Since you are using an alternative cost to cast the spell, you can't pay any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
If you choose to cast the exiled card, you do so while Bre's last ability is resolving and still on the stack. You can't wait to cast it later in the turn. Timing restrictions based on the card's type are ignored.
Bre's last ability will check as your end step starts to see if you gained life this turn. If you didn't, the ability won't trigger at all. Gaining life during your end step won't cause the ability to trigger.