No you lose. Look at the rarities. You're trading a common, which anybody can get right now. Judgement dragon is available in the Legendary Collection which anybody can buy right now in stores.
Armory Arm is a Rare, which is better than a Common in terms of Rarity.
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Rare armory is 5 and common reaper .50 while common JD is also 5ish-6 so it was a fair trade.
No you lose. Look at the rarities. You're trading a common, which anybody can get right now. Judgement dragon is available in the Legendary Collection which anybody can buy right now in stores.
Armory Arm is a Rare, which is better than a Common in terms of Rarity.