For all we know, trading will be designed as a casual social feature and all but useless to competitive players and completionist collectors
She can put a big dent in an aggressive players tempo and she can single handedly own the slower decks
You still want to have smaller sources of Incubate, though, as there are more tools to play with them than just Elvish Vatkeeper
The tournament rules also define an "Authorized Game Card" as the following: "Authorized Game Cards are cards that, unaltered, meet the following conditions: The card is genuine and published by Wizards of the Coast
However, if you have some first edition cards, especially those with printing errors, they could be valuable collectibles.
New Cards: [card]Fell Shepherd[/card] [D]/[F] While way too clunky and underpowered for cube, this card could find a home in weak EDH lists until he gets unfavorably compared to [card]Sheoldred, Whispering One[/card]