mtg creature copy cards Mimic Token The Gathering 3 Great Cards To Copy

Your opponents wont know how to deal with a 30-toughness wall backed by an army of immortal machines

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This is where cards like Chromatic Lantern or Fellwar Stone come into play

As well, most lower powered decks run only the bare minimum of Sol Ring and a few other effects while higher power decks run Null Rod and other artifact hate to keep the table fair

In fact there are examples of cards that could be considered strictly weaker than others that gain power with the right build (ie: Diabolic Intent vs Demonic Tutor in an Aristocrats style deck)