By completing the entire event and going undefeated, you'll receive a Ultimate Green Goblin promo card while supplies last
As for what could be in the missing spots, 439 is missing, which is a white card between Dion and Minwu, 457 is likely a red card before Clive alphabetically, a multicolour card at 485 between The Emperor of Palamecia and Garland, 504 between Rufus and Sephiroth, and 515 between Vivi and Xande
Credit: Wizards of the Coast The Infamous Crueclaw Loxi: If you've been in the magic scene for any time at all, you'll be well aware that any cards that allow you to cast things for 0 mana are quite potent
Garth is unlikely to see play in Modern, but is expected to feature in the popular singleton format, Commander
This terrifying play pattern is balanced out by the initial fragility of the Blinkmoth, but not enough to stop it being immensely powerful