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Llanowar Elves is worlds better since turn-1 ramp can be a killer, but that extra mana for a bit more resiliency does help against certain decks

Other must kill creatures provide multiple targets for removal, making it harder for an opponent to ensure they can take care of Niv-Mizzet

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

For example, if you've got an extra Sol Ring laying around and feel that the deck has just the right amount of ramp, take out Mind Stone for it

Galadriel could be a viable inclusion in Bant-colored Blink decks in Commander, where players might be able to trigger her ability multiple times