Collections from the old game should carry over too, though cards outside of Standard format won't be playable until a later Expanded format update (while Legacy format cards straight up won't be supported)
There are also some events that were giving out these cards to the public, according to @Quuador : Thanks for the info
They are a 10 cost with 11000 power, has Rush and a once per turn punishment that knocks out an 8000 power or less Character when the opponent activates a Blocker
Word of Command Look at target opponents hand and choose a card from it
Fire, Ice, Lightning: The Grand Masters are the Fire user Courtney with Moltres, Electric user Steve with Zapdos, Water user Jack with Articuno, and Rod, who uses Colorless and Water to approximate Dragons spearheaded by Dragonite
Graded Population Report: Scorbunny #31 Visualize the distrbution of grades in the chart