Urza, Lord High Artificer [Modern Horizons] Judgment As Gideon watched the initiate

As Gideon watched the initiate murder his crop-mate

Set: Antiquities Type: Enchantment Uncommon Cost: {3}{G} Each noncreature artifact loses all abilities and becomes an artifact creature with power and toughness each equal to its converted mana cost

or enchantment

Set: Urza's Destiny Type: Creature — Human Cleric Rare Cost: {3}{W} When Academy Rector dies

but by millennia of experience

Urza, Lord High Artificer [Modern Horizons] Judgment As Gideon watched the initiateSet: 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.