Its just way to whacky for me; unupped is completely different from upped and all of them have symmetrical effects that can go way out of whack.
for unupped youd proably want to get voodoodolls or armagios with devour (!!!), accel aint too big a whiff i guess, which is far too swingy. Also momentum is odd as it doesnt actually remove a skill and is also far weaker than the other effects. the fact you give one of these to every opponents creature also gets out of control, though this time its the mass accel you are most afraid off, while devour probably just replaces a more annoying ability (since your opponent may not have gravity and you probably have higher hp cards). Also its cost used to be way too high
For upped its in part essentially a fieldwipe (assuming a 2 dr shield), which is already really potent in stall (not much use elsewhere), but I think its the harder to evaluate part that actually will see more use. Just let your opponent almost kill you (never bother dealing dmg) and then otk them (with like 2 ugs or so). Its too much power for a single card imo, though I guess that was kinda the point of this comp.
And yh the gravity flavour is minimal.