Since it can snowball so easily with just a few tokens, Magnus will always have a place in Spellslinger decks
Fragile, yes, but kinda cute, too
Testing with Izzet Phoenix featuring one copy of The Royal Scions led me to believe that it is likely one of the best cards in the archetype if you can build around it
I'd also recommend stacking up on Forest of Vitality stadium card to evolve Bulbasaur on its first turn (but this can't be used on the first turn of the battle)
Late game black often loses with action/answers in hand simply because it is the wrong time for those cards
Now these formats, often encourage having a bunch of dudes in play, waiting to draw your enabler, or waiting till turn 4-5 to drop your lord, people will sit on their boardstate and a lot of these decks don't feel like they are encouraging you to stock up on Jace's Ingenuity to refill your hands