The playtest cards in the Mystery Boosters look very similar to those from Wizards R&D, with a white rectangle on the front of an existing card to represent the sticker, a funny placeholder name and art, as well as the all-important TEST CARDNot for constructed play text at the very bottom
Legacy & inherited will theme expansion
Starting out by being cast as a creature for one generic, one blue, one black, and one red to cast, Bolas can then be transformed into a planeswalker by paying four generic, one blue, one black, one red to transform
It evolves into Golem when traded, introducing players to the unique mechanics of trade evolution and encouraging social interaction among trainers
There are loads of iconic characters, monsters and even settings and activities that have been previewed from the decks releasing in June but there's one monster in particular that's piqued a lot of interest