Archfiend of Ifnir

An ability that triggers whenever you "cycle or discard" a card triggers only once if you cycle a card. The ability "Whenever you discard a card" is functionally identical to this ability; cycling is mentioned for clarity.

Some cards have an ability that triggers whenever you cycle any card. These triggered abilities resolve before you draw from the cycling ability.

An ability that triggers whenever you discard a card doesn't give you permission to discard cards. You'll need another effect that instructs or allows you to discard them.