30 new cards every two months, maybe three? Yah, can live with that. But every 4 months or so, nope. And I'm a MTG player, I'm not asking for the moon. We just want new cards regularly.
Dark Cultist will include the word 'random'.
Just play arena, you'll always face different decks and you'll always be able to create crazy random decks.. And you can do A LOT of arena until you earn every card in-game.