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701.57c: If the final card exiled during the process described in rule 701.57a has mana value N or less, it is the discovered card, regardless of whether it was cast or put into a players hand.
While transformed, you can pay three blue mana to convert Jetfire, Air Guardian back to its front side and put three +1/+1 counters on it

Advanced Search Sets Random Syntax Release date: 2022-01-10 Angel of Eternal Dawn Angel of Unity Captain Eberhart Divine Purge Ethereal Escort Expedition Supplier Faithful Disciple Inquisitor Captain Sigardian Evangel Slayer's Bounty Suntail Squadron Absorb Energy Unexpected Conversion Clone Crafter Discover the Formula Geist of Regret Geistchanneler Kindred Denial Obsessive Collector Oglor, Devoted Assistant Rimewall Protector Sinister Reflections Tireless Angler Cursebound Witch Assemble from Parts Break Expectations Citystalker Connoisseur Gutmorn, Pactbound Servant Patient Zero Predatory Sludge Puppet Raiser Sanguine Brushstroke Sap Vitality Veteran Ghoulcaller Arms Scavenger Bloodrage Alpha Brittle Blast Conductive Current Electrostatic Blast Fearsome Whelp Frenzied Geistblaster Rahilda, Feral Outlaw Rahilda, Wanted Cutthroat Tibalt, Wicked Tormentor Toralf's Disciple Town-Razer Tyrant Antique Collector Garruk, Wrath of the Wilds Geistpack Alpha Grizzled Huntmaster Hinterland Chef Hollowhenge Wrangler Ishkanah, Broodmother Lupine Harbingers Ravenous Pursuit Settle the Wilds Tenacious Pup Begin Anew Gitrog, Horror of Zhava Key to the Archive Soulstealer Axe Wickerwing Effigy Ominous Traveler Forsaken Crossroads

Considering the relatively low ink cost of all three Ducktails nephew cards, getting this ability rolling early on in a Lorcana game is entirely plausible, as well as being excellent gameplay-wise thanks to the advantage that additional card draw can get you