Judging by Mark Rosewaters comments, that should be exactly whatll happen
The options available are Amber/Amethyst, Ruby/Emerald, and Sapphire/Steel, all containing 60 pre-selected cards of the appropriate pairing that cover the essentials while including a few power players
At this point, however, thats looking unlikely
Cactuars 7 mana cost does keep it respectful, but in these days of fast mana and cheating creatures out, its not a stretch to imagine this card being a winning move out of nowhere
Hopefully, this wont be necessary, but its better to be safe than sorry.
While giving your opponent a whole new hand each turn sounds bad in theory, it actually breaks up their ability to sculpt and plan for future turns