The most critical is the size of your collection
They should help you win once Dragonstorm finds them
I definitely think that Im only scratching the surface when it comes to Bloomburrow and Im looking forward to playing these cards and seeing what other people do with them
Archmages Charm is extremely pushed, a solid permission spell, a good way to build card advantage for hitting land drops, and a fantastic tool against Deaths Shadow, Wild Nacatl, Goblin Guide, Pyxis of Pandemonium, Champion of the Parish, Aether Vial, Delver of Secrets, Hardened Scales, Amulet of Vigor, Benthic Biomancer, Glistener Elf, Noble Hierarch, Viscera Seer, and sometimes even Hexdrinker (just to mention a few)
Along with a symbol on these special dice triggering a planeswalk, there's also a chaos side of the die which causes a wild effect
The most prized cards of the bunch are the Imagine Courageous Critters from Bloomburrow s non-Standard offerings