Tablet of Discovery

When this artifact enters, mill a card. You may play that card this turn. (To mill a card, put the top card of your library into your graveyard.) {T}: Add {R}. {T}: Add {R}{R}. Spend this mana only to cast instant and sorcery spells.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o49qx1xajpb1h9a8h9x69.