Mindwhisker

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put it into your graveyard.) Threshold — As long as there are seven or more cards in your graveyard, creatures your opponents control get -1/-0.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ojdube05dpb1h3pg1zx2n.