Devourer of Effort

Whenever a spell, activated ability, or triggered ability is countered, put a +1/+1 counter on Devourer of Effort. (A spell or ability is countered if it is countered by a spell or ability, or if all of its targets become illegal after it is cast/activated/triggered but before it resolves.)
It feeds on dashed hopes, wasted efforts, and shattered dreams.