Saheeli, the Sun's Brilliance

The temporary copy is the throughline of the Saheeli line, not a departure from it: Saheeli Rai's -2 already stamped out a hasty duplicate that vanished at end step, and that was the half of Saheeli that broke a Standard format wide open next to Felidar Guardian. What this version does is make that effect the whole card and put it on a repeatable, mana-gated activation rather than a one-time planeswalker payoff. The design logic lives in what the one-turn window buys. Copy a creature or artifact with an enters-the-battlefield trigger and you fire it again; copy something with an attack trigger and the granted haste lets the token swing before it evaporates. Activate it during combat and you get an extra attacker or, on the defense, an extra blocker that costs you nothing lasting once it dies. The sacrifice clause is feeding as much as limiting: the token is an artifact no matter what it copies, so it dies as artifact fodder for anything that wants to eat it. That is the balancing act. Left permanent, a repeatable copy engine on a two-drop would snowball uncontrollably, so the ability pays for its flexibility by handing everything back at the end step, leaving you with the value you extracted rather than a growing board. The 2/2 body is incidental; the activated ability is the reason to run it, and it wants a deck built to wring a full turn out of one copied permanent.