It had already been decided that a trading card game was on the cards (pun intended), but before any official release, prototypes were made in order to test game mechanics and playability
Just mix and match two packs, shuffle, and youre ready to play
I believe that we can glean a hint of the answer in Mark Rosewater's latest State of Design article, from July this year
Everyone loves casting their favorite spells twice and we saw how popular that was with cards like Snapcaster Mage from the original Innistrad set
In my opinion, as a random person on Twitter who writes articles about card games, I dont think its necessary at all to mention theft effects during Rule 0
Incapsula incident ID: 350000780111537067-197161504537973647