Upon a Shooting Star [Single]

[Vector Nightmare]

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[b]Upon a Shooting Star[/b]
SPELL / Quick-Play
Return 2 Tuner monsters from your Graveyard to the top of your Deck in any order. Increase the ATK of a Synchro monster you control by the combined Level of the returned monsters x200.

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[Zeppeli Gyro Supreme]

You would wreak havoc if you used this card with "Emissary from Pandemonium". Over 4000 ATK boost. Though then if you messed up you would have dead draws. lol

[Shadow Legacy]

there level 5 and 8 monsters?
Shooting Stardust Dragon
+XXXX attack, garantied 2 attacks

OPed

[Trebuchet MS]

Maybe if you tuned down the power boost to (Level x 100) it'd be more tolerable. Or maybe if you put a Level cap from which the Tuners can be selected.

[Vector Nightmare]

In the current TCG, pre-STBL, there are 4 Tuner monsters of Level 5 or higher. The first is Quickdraw Synchron, which is good, but bad in a deck focused around summoning Shooting Star Dragon. The second is Ally Mind, a vanilla of no interest. The third is Egotistical Ape, which works well only with Beast-Type monsters, which is generally not what you'd have in an SSD deck. And the final, Emissary from Pandaemonium, is a damn dead draw that I would not imagine putting in any kind of deck.

So yeah, no. I could add a limit, perhaps in sight of future releases, but as it is I hardly think the existence of any of the above makes this OP to any extent. Reducing the ATK boost to 100 would make the bonus trifling, and you should understand that while this card is meant to work with SSD (giving him 2 guaranteed attacks, and buffing him up a little), it's by no means an auto-kill with him.