Urtümliche Ausgeburt

Falls die Urtümliche Ausgeburt ins Spiel kommen würde und sie nicht gewirkt wurde oder kein Mana ausgegeben wurde, um sie zu wirken, schicke sie stattdessen ins Exil.
Wachsamkeit, verursacht Trampelschaden, Lebensverknüpfung
Wenn die Urtümliche Ausgeburt das Spiel verlässt, schicke die obersten zehn Karten deiner Bibliothek ins Exil. Du kannst davon eine beliebige Anzahl an Zaubersprüchen mit Gesamt-Manabetrag 10 oder weniger wirken, ohne ihre Manakosten zu bezahlen.

Engeance primitive

Si l'Engeance primitive devait arriver sur le champ de bataille et qu'elle n'a pas été lancée ou qu'aucun mana n'a été dépensé pour la lancer, exilez-la à la place.
Vigilance, piétinement, lien de vie
Quand l'Engeance primitive quitte le champ de bataille, exilez les dix cartes du dessus de votre bibliothèque. Vous pouvez lancer n'importe quel nombre de sorts avec une valeur de mana inférieure ou égale à 10 parmi elles sans payer leur coût de mana.

原始の落とし子

原始の落とし子が、唱えられることなく、または唱えるためにマナが支払われることなく戦場に出るなら、代わりにこれを追放する。
警戒、トランプル、絆魂
原始の落とし子が戦場を離れたとき、あなたのライブラリーの一番上にあるカード10枚を追放する。あなたはその中から、望む枚数の呪文をマナ総量の合計が10以下になるように選び、マナ・コストを支払うことなく唱えてもよい。

太古后裔

如果太古后裔将进战场，且它未经施放或施放时没有支付过法术力，则改为将它放逐。
警戒，践踏，系命
当太古后裔离开战场时，放逐你牌库顶的十张牌。你可以从其中施放任意数量的咒语，且不需支付其法术力费用，但这些咒语的法术力值总和须等于或小于10。

Primeval Spawn

If Primeval Spawn would enter and it wasn't cast or no mana was spent to cast it, exile it instead.
Vigilance, trample, lifelink
When Primeval Spawn leaves the battlefield, exile the top ten cards of your library. You may cast any number of spells with total mana value 10 or less from among them without paying their mana costs.

Dominaria United Commander

If Primeval Spawn would enter the battlefield and it wasn't cast or no mana was spent to cast it, exile it instead.
Vigilance, trample, lifelink
When Primeval Spawn leaves the battlefield, exile the top ten cards of your library. You may cast any number of spells with total mana value 10 or less from among them without paying their mana costs.

As long as mana was paid for any cost to cast Primeval Spawn, it enters the battlefield as it resolves. It will not be exiled as it tries to enter the battlefield, even if its cost was reduced or a cost other than its normal mana cost was paid.

Conversely, if an effect would cause Primeval Spawn to enter the battlefield as a copy of another permanent, it will enter the battlefield as a copy of that permanent whether or not it was cast or mana was spent to cast it.

If Primeval Spawn is exiled by its first ability as it tries to enter the battlefield, it goes directly to the exile zone without entering the battlefield first. Since it never enters or leaves the battlefield, its last ability won’t trigger.

If a creature token that is a copy of Primeval Spawn would be put onto the battlefield, it’s put into exile instead and then ceases to exist. Creature tokens are never cast, even if the spell that created them was.

If an effect causes a card to enter the battlefield as a copy of Primeval Spawn and that permanent wasn’t cast or no mana was spent to cast it, that card will be exiled instead of entering the battlefield.

If an effect from a static ability would remove all abilities from Primeval Spawn if it were on the battlefield (such as that of Humility), then its first ability won’t cause it to be exiled. It will enter the battlefield as normal.

If the spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

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 any additional costs. If the spell has any mandatory additional costs, you must pay those.

Primeval Spawn’s last ability checks the mana values and types of the spells on the stack, not the mana values and types of the cards in exile. Notably, this means that you may cast the back face of a modal double-faced card or either face of a split card as long as the spells you are casting together have a total mana value of 10 or less.

The spells are cast one after the other during the resolution of Primeval Spawn’s last ability. The one you cast last will be the first one to resolve.