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Players can get upset for getting the "wrong kind" of booster

Blood is constant

If the copy is a permanent spell, it gains haste and "At the beginning of your end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.) Any spell you cast will be copied if you pay the cost, not just one that requires targets

This means we could be nearly unaffected by Mana Maze, which now might as well be an asymmetrical copy of Arcane Laboratory

Disturb is a mechanic introduced in Innistrad: Midnight Hunt, and has cards being cast from the graveyard in new forms

Some amount of 1-for-1 interaction, like Swords to Plowshares and Swan Song, is necessary for efficiency, but that cant be all you play