The Secret of the Chalice

At the beginning of your upkeep, you may pay {x}{x}. If you do, create X blood tokens. (It's an artifact with "{1}, {t}, Discard a card, Sacrifice this artifact: Draw a card.")
Blood tokens you control are Equipment in
addition to their other types and have "Equipped creature gets +0/+2" and equip {2}.
As long as you control a blood token, The Secret
of the Chalice cannot attack or block.