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Malleable Impostor is an excellent Clone variant, allowing you to copy any Creature an opponent controls at Instant speed

Thats fine

If it changes zones, it will either cease to exist (if it's a token) or cease to be a copy (if it's a nontoken permanent), and so you won't be able to cast it as an Adventure

Cards in Standard and Set boosters are generally the same, while Collector's boosters may feel slightly thicker

From the Rubble is a generic typal payoff that should see play across multiple decks, and Master of Dark Rites provides the type of mana acceleration that makes me wonder if it has any 60-card Constructed applications

Less happily, milling does not generally impact the game