Corpses of the Lost {2}{B}
Enchantment
Skeletons you control get +1/+0 and have haste.
When this enchantment enters, create a 2/2 black Skeleton Pirate creature token.
At the beginning of your end step, if you descended this turn, you may pay 1 life. If you do, return this enchantment to its owner's hand. (You descended if a permanent card was put into your graveyard from anywhere.)
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Cards that do something similar expected a card that isn't here?
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Sanguine Spy 82%
$0.30#13133
"At the beginning of your end step, if there are five or more mana values among cards in your graveyard, you may pay 2 life. If you do, draw a card."
Necrodominance 82%
$2.50#4288
"At the beginning of your end step, you may pay any amount of life. If you do, draw that many cards."