Khabál ability

The Khabál ability is a slang term used by Magic R&D to describe the ability that whenever another creature dies, you put a +1/+1 counter on the creature with the ability. This ability is nicknamed after the first creature to have it: Khabál Ghoul from Arabian Nights.

Khabál is Arabic for "Night" or "Maddened". As black is the color of death, the ability is primary in black, but R&D has started doing it occasionally in red.