Lyzolda, the Blood Witch Avatar

Hellbent — As long as you have no cards in hand, if a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead. Hellbent — At the beginning of your end step, if you have no cards in hand, each of your opponents discards a card.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6onf2bh2nvpb1hlbmr946w.