Quag Vampires

Multikicker {1}{B} (You may pay an additional {1}{B} any number of times as you cast this spell.) Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) This creature enters with a +1/+1 counter on it for each time it was kicked.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oivapdm97pb1h9ate0ws8.