Desdemona, Mistress of Shadows

Reach
{2}Silvery Barbs
Roll a d20
1: Critical Fail

2-12: Counter target instant, sorcery, activated ability, or triggered ability unless opponent pays. {1}

13-19: Counter target instant, sorcery, activated ability, or triggered ability unless opponent pays. {2}

20: Counter target instant, sorcery, activated ability, or triggered ability.