Like most Magic: The Gathering cards, the value of Jade Mage depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Commander 2013)
(You may look at booster packs passed to you.) Watermark: Conspiracy Seal Illustrated by Eytan Zana Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Non-foil showcase or borderless rare or mythic rare This slot features a Booster Fun card in every Collector Booster
The perfect amount of land for your deck depends on a few factors
Because it checks almost every box we could wish for in a removal for our Commander deck: Targets almost any permanent Instant speed Weak drawback Theres no reason not to play this, except maybe its price point which is already creeping around the $2 cost for an Uncommon Standard card
I hope that you also find plenty of new cards to enjoy