Urza, Lord High Artificer (Retro) [Modern Horizons] Soulblight Gravelords sacrifice it unless you sacrifice

sacrifice it unless you sacrifice any number of creatures with total power 12 or greater

Dragonsoul deals 1 damage to each opponent and each creature your opponents control

this dragon is gifted with untapped power

you may shuffle Guan Yu into your library

Then those choices are revealed

Urza, Lord High Artificer (Retro) [Modern Horizons] Soulblight Gravelords sacrifice it unless you sacrificeSet: Modern Horizons Type: Legendary Creature Human Artificer Rarity: Mythic Cost: {2}{U}{U} When Urza, Lord High Artificer enters the battlefield, create a 0 0 colorless Construct artifact creature token with "This creature gets +1 +1 for each artifact you control." Tap an untapped artifact you control: Add {U}. {5}: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.