永劫の無垢

絆魂
あなたがコントロールしていてパワーが２以下でありこれでない１体以上のクリーチャーが戦場に出るたび、カード１枚を引く。この能力は、毎ターン１回しか誘発しない。
永劫の無垢が死亡したとき、これがクリーチャーであった場合、これをオーナーのコントロール下で戦場に戻す。これはエンチャントである。（これはクリーチャーではない。）

Enduring Innocence

Lifelink
Whenever one or more other creatures you control with power 2 or less enter, draw a card. This ability triggers only once each turn.
When Enduring Innocence dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)

Duskmourn: House of Horror

Duskmourn: House of Horror Promos

A token that's a copy of Enduring Innocence won't return to the battlefield when its last ability resolves.

Enduring Innocence's second ability checks the power of the other creatures only at the moment they enter. If a creature enters with counters, those counters are included. If a creature's power is 2 or less when it enters but becomes greater than 2 while Enduring Innocence's second ability is still on the stack, you'll still draw a card when the ability resolves.

If a nontoken permanent that's a copy of Enduring Innocence dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.

Sheep and Glimmer are both creature types. Enduring Innocence won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.