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Gym Leader Challenge format has its own ban list which you can find here

Kess, Dissident Mage Another of the many spellslinger commanders that work well with extra turn spells, Kess, Dissident Mage offers incredible value

Manufacturer MPN CLI61217 Model# 61217 Alternate Product Number 623033 UPC Code 038944612171 UNSPSC Code 1 Card Capacity 200 Card File Refills Type Business Card Binder Page Card Size (H x W) 2" x 3.5" Cards Per Sheet 20 Color(s) Clear For Card Size 2" x 3.5" Global Product Type Height 11.25" Material(s) Polypropylene Post-Consumer Recycled Content Percent 0% Pre-Consumer Recycled Content Percent 0% Total Recycled Content Percent 0% Width 8.13" Assembly Required No assembly is required Contains Recycled Materials N Green Product N Unit of Measure Pack Item Weight 0.8 Ships via UPS Y Carton Pack Quantity 50 Pack Box Pack Quantity 5 Pack Pack Quantity 10 Each This item is sold by the Pack which contains 10 Each GTIN Item 038944612171 GTIN Box 30038944612172 UPC Retail 038944612171 UPC Carton 50038944612176 Brand Brand Contact 847-827-6661;800-323-6084 Manufacturer Stock No

You can go above 51, but you wont be able to play the deck in most versions of the game