Your search for "Symmetry Matrix 252" revealed the following:
Symmetry Matrix (BRO) from The Brothers' War, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Slawomir Maniak Card Text:Whenever a creature with power equal to its toughness enters the battlefield under your control, you may pay 1. If...
Symmetry Matrix (Foil) (BRO) from The Brothers' War, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Slawomir Maniak Card Text:Whenever a creature with power equal to its toughness enters the battlefield under your control, you may pay 1....