"Jarad fancies himself king of the undercity, but he's merely king of rot."

Necropolis Regent

Flying
Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it.

Foundations Jumpstart

Crimson Vow Commander

Commander 2021

Explorers of Ixalan

Return to Ravnica

If that creature deals combat damage to a player at the same time it's dealt lethal damage (perhaps because it has trample and was blocked), it will die before the triggered ability resolves and puts +1/+1 counters on it.