Zur is a fantastic commander, but none of these are exceptionally expensive cards
While your first instinct might be to spend your Yu-Gi-Oh Master Duel gems on packs to get the card you want, you can also craft cards using something called craft points
Ok Palkia-GX #119 (Pokemon Forbidden Light) Details All prices are the current market price
And you can punish your opponents really hard with cards like Twilight Prophet
As for Commander play, the Avatar Horror features in Winter, Misanthropic Guide and Victor, Valgavoths Seneschal, which focuses on graveyard synergies
For the rest of this turn, you cannot Special Summon monsters, except WATER monsters, also, double the first battle damage inflicted to your opponent this turn by your "Number" monster battling another monster