While Necrodominance is on the battlefield under your control, abilities that trigger whenever a permanent you own is put into your graveyard from the battlefield (for example, "When this creature dies") won't trigger because cards and tokens are never put into your graveyard
The repeated Heat Shimmer mode is also very expensive, and its only good with specific creatures with enters abilities or huge threats
That means, assuming youre not doing anything more absurd than simply casting it, that you can draw seven cards, basically for free, every single turn with no issues
For example, Sakura-Tribe Elder's activated ability lets you put an Omnipresent Impostor onto the battlefield tapped, while Goblin Engineer's enters ability lets you put an Omnipresent Impostor into your graveyard
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Commander is the MTG format that allows the most creativity, and its the bastion of deck brewers, casuals and competitive players alike