High Alert [Ravnica Allegiance] Legendary Creature — Legendary Creature Set: March of the Machine

Set: March of the Machine Commander Type: Creature — Phyrexian Artificer Rarity: Rare Cost: {6}{W} Whenever Darksteel Splicer or another nontoken Phyrexian enters the battlefield under your control

Set: War of the Spark Type: Sorcery Rarity: Common Cost: {1}{U} Return target nonland permanent to its owner's hand

but they also got her back in

Set: Dominaria Remastered Type: Sorcery Rarity: Common Cost: {2}{B} Target creature gets -3/-3 until end of turn

They likely refer not to one mage

High Alert [Ravnica Allegiance] Legendary Creature — Legendary Creature Set: March of the MachineSet: Ravnica Allegiance Type: Enchantment Rarity: Uncommon Cost: {1}{W}{U} Each creature you control assigns combat damage equal to its toughness rather than its power. Creatures you control can attack as though they didn't have defender. {2}{W}{U}: Untap target creature.