Hydras are the perfect tribe to do this with, as their flexible casting costs means you can always adjust your newest creature to be stronger than the last one you cast, triggering Selvala and drawing you an extra card
One of these will be shockingly good in Standard, to my chagrin, but Ive got serious doubts about some seemingly popular cards like: Dragonhawk, Fate's Tempest Eluge, the Shoreless Sea Glarb, Calamity's Augur Helga, Skittish Seer Hugs, Grisly Guardian Mabel, Heir to Cragflame Muerra, Trash Tactician Vren, the Relentless Wick, the Whorled Mind So yeah, most of the story arc cast is underwhelming
As is usually the case with MTG Play Booster Boxes like these, youre getting 30 Play Boosters, each with 14 cards and at least one rare or mythic rare, plus a foil card in every pack which is exactly what you want out of a big sealed box: plenty of shots at the coolest cards and enough cardboard to fuel multiple draft nights
The fact that it hits all nonland permanents makes this very potent