Despite its drawbacks, any card that can get up to 52 creatures in a commander game for as little as one black mana is going to get attention, and its expected Blasphemous Edict will be no different.
Good examples would be Salamangreat Violet Chimera, which gets a powerful ability if you use a different Salamangreat Violet Chimera as material, or Dual Avatar - Manifested A-Un, which gets a range of different powerful effects for summoning with different Fusion monsters
If the opponent has no artifact or creature cards in their hand, you must still choose an artifact or creature card from their graveyard to exile
What impact do those cards have on the format
If you do not take Prize Cards during the game, the opponent will struggle to stop you from using Deck and Cover each turn
You can start by looking at the MTG color combinations to understand what each pair does well