Thats a much-needed measure to change the best strategies and to prevent a certain deck from dominating
Let's look at just the last three items (the token, gold, and gems): You get 1,200 gems back
Unctus's Retrofitter Speaking of Limited strategies, back in Phyrexia: All Will Be One , Unctus's Retrofitter was one of the few payoffs for turning artifacts into 4/4 creatures
Mjolnir, Hammer of Thor is another obvious attention-grabber because it features the Worthy mechanic, allowing only legendary, non-villain red or white creatures to wield it
Happy anniversary, Magic
It doesn't copy whether the creature is tapped or untapped, whether it has any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on