Halrormalenth Riftwalker

Rank III - Knight
Zealot
Halrormalenth's Favor (When a Being card changes
color to Black, Green, or Black/Green, place a +1/+1 counter on this card.)
Taint {b}{b} (Target a Being or Artifact card on the
field and it gains the effect: "All of this card's abilities
have their activation costs changed to Black.")