If its an instant or sorcery card, you may cast it without paying its mana cost
Theres a lot of welcome artifact-centric cards in here, from other artifact focused commanders (Padeem, Silas Renn, Muzzio and Emry), old favorite EDH staples of days past (Mirrorworks, Trading Post and Oblivion stone), newer additions to the artifact canon (Oni-Cult Anvil, the previously mentioned Cursed Mirror) and everything in between
Aether Inspector : Creature (Dwarf Artificer), casting cost of three generic and one white mana, 2/3
Accumulate Wisdom This card requires lessons to be good, but when youre chaining lesson into lesson, it becomes a 2-mana draw-3
At the beginning of the next end step, return that card to the battlefield under its owners control
Maybe youve got some wicked Mythical Archive scores