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One of the easiest ways to do this via a huge selling platform is through eBay

Sagas in Sigurd's colors that work especially well with this effect include Elspeth Conquers Death, Fable of the Mirror-Breaker, and There And Back Again

Avatar Destiny Enchantment Aura Enchant creature you control Enchanted creature gets +1/+1 for each creature card in your graveyard and is an Avatar in addition to its other types

If this version becomes standard, then it might be better to do something differently or have more cards for the mirror

Labyrinth Wall turned the field into a 9x9 grid, could be shifted using the Magical Labyrinth Spell Card, and allowed monsters to move a number of spaces equal to their level