I feel there is too much competition between this and Spotlight Unit, with this one clearly losing. Looking to see if we can change it to something else. "Target creature gets +2/+0 until end of turn" would work, but it does nothing when you have no creatures around to buff.

We could also have it be a choose-one card, with one option valid when you have no creatures, although it does stretch the cycle a bit.
"Whenever upgraded artifact becomes tapped, choose one - Target creature gets +2/+0 until end of turn; CARDNAME deals 1 damage to target opponent".

Other suggestion : "exile the top card of your library. Until end of turn, you may play that card."

I defiantly agree that this and (((blinding unit))) share a lot of th same space. Additionally, while I love the idea of "1 damage to target player" it unfortunately steps on the toes of (((syphon unit))).

Your second suggestion, "Exile the top card" might be ok but it could also be really, really good. I'd be ok with trying it for now but we'd need to keep a close eye on it.

Yeah I think flat out the Chandraw is going to be too strong. What about looting?

Red looting or blue looting?

Probably red? Could go either way I guess.

well, if we're keeping to the cycle, it should be red looting since this is the "red" component.

So, something like this?

Looting unit
Artifact - component
Upgrade
Whenever upgraded artifact becomes tapped, discard a card. If you do, draw a card

I would add "may" to that but otherwise, yes, that looks great. Might be a little strong though, put one of those little red minesweeper flags on it and leave it be for now.