Redcap Gutter-Dweller
Menace When this creature enters, create two 1/1 black Rat creature tokens with "This token can't block." At the beginning of your upkeep, you may sacrifice another creature. If you do, put a +1/+1 counter on this creature and exile the top card of your library. You may play that card this turn.
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Official rulings (2) · Scryfall
If Redcap Gutter-Dweller leaves the battlefield after its last ability has triggered, you can still sacrifice a creature and exile the top card of your library, even though you won't put a +1/+1 counter on Redcap Gutter-Dweller.
You pay all costs and follow all normal timing rules for cards played with the permission granted by Redcap Gutter-Dweller's last ability. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.