Dormammu Signature Ability

Can somebody explain to me what does Dormammu Signature Ability do?

Thanks for your answer.

Comments

He has a chance to place a degen on the opponent when a buff expires.

Afrid wrote: »

He has a chance to place a degen on the opponent when a buff expires.

To add: The longer it has been since the last degen trigger, the greater the chance to place degen when the next buff on the opponent expires.