Mirror, Mirror

Mirror, Mirror was a short MTG Arena held event on July 3-6, 2021 that featured rebalanced versions of some of Historic's iconic banned cards.^[1]^[2]^[3] It was a precursor to rebalanced cards, and the Mirror, Mirror versions of Omnath, Locus of Creation and Teferi, Time Raveler would later be the rebalanced versions introduced in Historic; Fires of Invention went to costing instead of , Winota, Joiner of Forces would get a different rebalancing, and Omnath would later return to drawing a card while keeping the cost increase.

List

Original card	Changes to the card
Agent of Treachery	The enters the battlefield ability triggers only if cast from the hand.
Field of the Dead	The land is now legendary and Zombies enter the battlefield tapped.
Fires of Invention	Mana cost increased from to .
Nexus of Fate	The card exiles itself when cast and does not shuffle itself into its owner’s library.
Oko, Thief of Crowns	The first ability gives +1 loyalty instead of +2. The second ability now takes -2 loyalty instead of giving +1.
Omnath, Locus of Creation	Scry 1 when entering the battlefield rather than drawing a card.
Once Upon a Time	Costs instead of when it’s the first spell each game.
Teferi, Time Raveler	Mana cost increased from to and initial loyalty increased from 4 to 5.
Uro, Titan of Nature’s Wrath	No longer allows you to put a land card from your hand onto the battlefield.
Veil of Summer	Mana cost increased from to .
Wilderness Reclamation	Untaps two lands instead of all.
Winota, Joiner of Forces	Look at the top four cards of your library instead of six.