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Drop that to one mana each, two total with Heartstone or Training Grounds

Of course, this runs the risk of your opponents drawing that many cards and still having a main phase, but thats why you have Plagiarize, right

Do some mana fixing by copying Urborg, Tomb of Yawgmoth or commander protection by copying Karakas as long as either of them are in a graveyard

You either create cards that just objectively suck (i.e.: most of this list), or you risk making an actual good leyline that breaks the game by nature of how these cards work

Prey Upon lets one of your creatures fight anothermeaning they each deal their power to the other

There is a small chance that one of your Common or Uncommon cards can be replaced with a card of a higher rarity