Tis the season for MBS Spoilers, lalalala la la lala. Right? Something like that. Check out what Santa left under our Christmas tree. Four Mirrodin Besieged Intro Packs, and the Mirrodin Besieged Box.

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Thanks to @LautaroLobos for the tip on the intro packs!

Update: The images also appear to have been posted on MTGSalvation here by user CopySix.