"[You bought] competing offers that you never paid for, nor had the intention to do so," Cardmarket's letter says
But if you had the Tome of Knowledge then the limit was increased by one at all levels
I love using Luminarch Ascension in Zur lists, it's often a great play whenever you draw into it, and it's a good fetch if you can't be attacked (stuff like your Propaganda, Ghostly Prison, but also Solitary Confinement are all good ways to protect yourself, Solitary is protection plus a ton of upside, but you'll need a card draw source, fortunately Zur can find many!)
Reckless Greed Reckless Greed gives you more cards now at the cost of cards later
To begin with, cards such as Wilhelt, the Rotcleaver , Endless Ranks of the Dead , Cemetery Reaper , Eternal Skylord and Liliana's Mastery make Zombie tokens, then the deck can sacrifice them