mtg flip cards summoning sickness Does a creature copied with Mirage Mirror have sickness? Copy an non summoning sickness?

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I understand that it is the best artifact in the best deck of the format, but this is not my logic for this list

She simplifies deckbuilding by providing built-in ramp, rewards playing Angels naturally, and works well with a budget-friendly mana base

People are going to brew with this for sure

Creature - Human Rogue Sepulchral Primordial Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.) When this creature enters, for each opponent, you may put up to one target creature card from that player's graveyard onto the battlefield under your control

What you need is a little bit of knowledge