Normally, a downside to Auras in Voltron decks is that if the creature gets removed, the Aura doesn't stick around
It provides us at the beginning of our upkeep, with draw X cards, where X is the number of Zombies we control (with the downside of also losing X life)
Boros Charm and Heroic Intervention might find a home alongside the Inspiring Call in this deck
It can't be the target of Pinnacle Monk's last ability ("When Pinnacle Monk enters the battlefield, return target instant or sorcery card from your graveyard to your hand")
The card quality and tutor effects are simply much more mana efficient so unless the combo deck has alternate uses for the specific draw spell such as a discard outlet or recursion effect it will avoid the latter in preference for the former
It provides a secure storage solution for organizing and transporting Commander decks, keeping them safe from bending or damage during travel and ensuring easy transport and peace of mind during travels