The option to transfer cards from earlier sets, namely the other Sun & Moon expansions, the XY series, and the Black & White series, will go live at some later point
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For the Ancestors The slivers deck is bringing a few goodies with its new cards, and For the Ancestors isnt just wanted for sliver decks
Of course, there are other ways of playing as well, including very competitive Challenge events each weekend all the way up to Pro Tour Qualifiers, and while these events typically cost more to enter ($25 or $30, depending on the specific event), they also have more prizes to support the higher entry cost
Blighting involves putting a -1/-1 counter on a creature you control, enhancing gameplay tactics
Commander decks also have a commander that is in the command zone that you can cast whenever it is legal to play a creatuer