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Clones take many forms, pun fully intended, but the traditional use of the name refers to shapeshifting permanents that either enter the battlefield as copies or copy something else at a later time
The sacrifice ability occasionally came in handy, guarding against mass removal even though it was never the primary motivating factor, and it was hard for decks running him to justify keeping the necessary mana untapped until very late in the game
The Energy is probably negligible, except in a deck that cares about it, but for a Commander deck in at least Izzet colors, this is pretty solid
If theres another good early ramp spell that would enable this on turn 3, then perhaps