Printed copies come in starter packs, or they can be downloaded from Ravensburger here
You really need to get through Tomb of Annihilation for the Archlich to be useful, but it can be a real problem for your opponents once you do
Accessories Protect your collection from wear and tear with card sleeves, deck boxes, and playmats
Unlike the other three versions in their various colors, Omnath, Locus of the RoilOmnath, Locus of the Roil has a niche and sticks to it
Rampaging Baloths will trigger 8 times and you get eight 4/4 tokens for free
Mist Dancer comes back from the grave with a vengeance, granting all your flying Merfolk an extra three power for the turn, and perhaps letting you close out the game