Squirrel Sanctuary 
Enchantment
When this enchantment enters, create a 1/1 green Squirrel creature token.
Whenever a nontoken creature you control dies, you may pay {1}. If you do, return this enchantment to its owner's hand.
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Cards that do something similar expected a card that isn't here?
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Foster 87%
$0.26#21103
"Whenever a creature you control dies, you may pay {1}. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest into your graveyard."
Koll, the Forgemaster 85%
$0.18#7300
"Whenever another nontoken creature you control dies, if it was enchanted or equipped, return it to its owner's hand."
Liesa, Forgotten Archangel 85%
$1.98#2058
"Whenever another nontoken creature you control dies, return that card to its owner's hand at the beginning of the next end step."
Ares, God of War 84%
$0.35#15467
"Whenever an attacking creature you control dies, return that card to its owner's hand."
Meathook Massacre II 83%
$2.55#3054
"Whenever a creature you control dies, you may pay 3 life. If you do, return that card under your control with a finality counter on it."
Remembrance 82%
$9.46#12714
"Whenever a nontoken creature you control dies, you may search your library for a card with the same name as that creature, reveal it, put it into your hand, then shuffle."