The effect's discard cost means this deck can't stay on the offensive forever, but your series of buffed attacks will cause your opponent's hand and Life to quickly evaporate
As you can see, theres a whole swath of blue cards I expect to make waves in different formats once Theros Beyond Death releases
Deck databases are great for knowing what the best players are up to
At common and uncommon levels, the quality difference is minimal
So, when it dies, you'll improve your hand and ramp, and both of these effects are great when you're behind
Ghostly Flicker does all of those things and more, and its easy to see why that would lend it to being a combo enabler, too