Promise of Tomorrow {2}{W}
Enchantment
Whenever a creature you control dies, exile it.
At the beginning of each end step, if you control no creatures, sacrifice this enchantment and return all cards exiled with it to the battlefield under your control.
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Cards that do something similar expected a card that isn't here?
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Chaos Shrine's Black Crystal 95%
$4.53#13337
"Whenever a nontoken creature you control dies, exile it."
Shelob, Dread Weaver 89%
$0.37#5753
"Whenever a nontoken creature an opponent controls dies, exile it."
Sothera, the Supervoid 85%
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"Whenever a creature you control dies, each opponent chooses a creature they control and exiles it."
Myrkul, Lord of Bones 82%
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"Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that card, except it's an enchantment and loses all other card types."
Hofri Ghostforge 82%
$0.22#7032
"Whenever another nontoken creature you control dies, exile it. If you do, create a token that's a copy of that creature, except it's a Spirit in addition to its other types and it has "When this token leaves the battlefield, return the exiled card to its owner's graveyard.""
Nightmare Shepherd 81%
$0.34#4176
"Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types."