Korvold, Fae-Cursed King
Legendary Creature — Dragon Noble
Flying
Whenever Korvold enters or attacks, sacrifice another permanent.
Whenever you sacrifice a permanent, put a +1/+1 counter on Korvold and draw a card.
Transformed at his own wedding, he promptly ate the banquet, the gifts, and the guests.
Illustrated by
Edge of Eternities Commander#120MythicEnglishLegality
Rulings
If you somehow control no other permanents, you can attack with Korvold. You won’t sacrifice anything, and there’s no penalty for being unable to do so.
Korvold’s last ability is a triggered ability, not an activated ability. It doesn’t allow you to sacrifice a permanent whenever you want; rather, you need some other way of sacrificing permanents, such as Korvold’s first triggered ability.
If you sacrifice a permanent as part of a spell or activated ability’s cost, Korvold’s last ability will resolve before that spell or ability.
If you sacrifice Korvold, its last ability triggers. You won’t put a +1/+1 counter on anything, but you’ll draw a card.
A legendary permanent that is put into a graveyard because of the “legend rule” isn’t sacrificed.