the one that you only open once in a blue moon if you're flush with cash, win it as a prize at your game store, or get as part of the annual Gift Bundle
Other colors: Necrons, especially Crypteks, are technologically sophisticated, which implies blue should be one of their colors

Event Schedule Midweek Magic February 28March 2: Into the Future March 79: On the Edge March 1416: Strixhaven: School of Mages Bot Draft March 2123: Historic Pauper Quick Draft February 17March 2: Phyrexia: All Will Be One March 317: Innistrad: Crimson Vow March 1731: Phyrexia: All Will Be One Other Events February 2528: The Fair Basilica February 28March 10: Alchemy: Phyrexia Premier Draft March 1021: Strixhaven: School of Mages Premier Draft March 1720: Historic Metagame Challenge Premier Play Qualifier Play-Ins Best-of-One Qualifier Play-In March 4, 6 AM PTMarch 5, 3 AM PT Format: Standard Best-of-Three Qualifier Play-In March 10, 6 AM PTMarch 11, 3 AM PT Format: Standard Qualifier Weekends March 11, 6 AM PTMarch 12, 4 PM PT Format: Standard The Arena Open Arena Open March 45 Day 1, March 4: Phyrexia: All Will Be One Sealed (Best-of-One and Best-of-Three) Day 2, March 5: Phyrexia: All Will Be One Player DraftThere are two Player Draft events on Day 2

Commander Wyll, Blade of Frontiers If you would roll one or more dice, instead roll that many dice plus one and ignore the lowest roll
But +3/+3 for a single mana is a fantastic rate for this black aura if you can both reliably enable delirium and care about buffing creatures
Flameblade Angel: A nice way of keeping creatures off your face, no one is going to want to run themselves into a bunch of damage