The team played with it and liked it enough to commit to creating a rare cycle of creatures
Ideally, you will take advantage of Pluto, Friendly Pooch to play even more cards or play more powerful cards early
They don't copy whether that creature was tapped or untapped, whether it had any counters on it, whether it had any Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on
Centaur of Attention gets +X/+X, where X is the greatest number of stored results on it of the same value
Any deck that plays white and struggles with threat-density will eventually ask the question: What if I add Stoneforge Mystic? Occupying only six slots in the maindeck, the two-drop and his weapons add enormous consistency and speed to most decks, be it aggro or control