Given its play patterns to date, one copy should be more than enough for most players, mind you
But most multiplayer Commander decks leave at least a few creatures untapped to fend off attacks, which provides an opportunity for Calamity of Cinders

Deck 2: Orcust 1 Red-Eyes Black Dragon 1 Dark Magician 1 Orcust Brass Bombard 1 Orcust Cymbal Skeleton 1 Orcust Harp Horror 3 Orcust Knightmare 1 World Legacy World Wand 1 Armageddon Knight 2 Dark Grepher 2 Mathematician 3 Girsu, the Orcust Mekk-Knight 2 Maxx C 3 Ash Blossom & Joyous Spring 1 Effect Veiler 1 Red-Eyes Fusion 1 Reinforcement of the Army 1 Foolish Burial 1 Orcustrated Babel 2 Orcustrated Return 3 Called by the Grave 3 Crossout Designator 2 Just One Forbidden Drop 2 Infinite Impermanence 1 Orcust Crescendo 1 Linkriboh 1 Galatea, the Orcust Automaton 2 I:P Masquerena 1 Knightmare Phoenix 1 Predaplant Verte Anacodna 1 Knightmare Unciron 1 Longirsu, the Orcust Orchestrator 1 Topologic Trisbaena 1 Topologic Zeroboros 1 Topologic Bomber Dragon 1 Accesscode Talker 2 Dingirsu, the Orcust of the Evening Star 1 Red-Eyes Dark Dragoon Side Deck: 2 D.D
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The one thing that keeps this card in check is the necessity to build around it
The goal is to either +1 and untap enough mana from mana rocks that youre basically getting Tezzeret for free, or -3 to tutor up a good artifact and leave Tezzeret in play