Making it artifact creatures could work in red/black hybrid. Red gets artifact removal and Wheel of Fortune effects, while black gets creature removal and giving up one resource for another. Looting isn't black but drawing based on your graveyard should be.
I don't care about the flavor. You shouldn't break the color pie because of flavor. If it were all about flavor, there would be no color pie. Black doesn't destroy artifacts.
You could, perhaps, change it to "destroy all artifact creatures," and that would only feel strange without actually breaking the pie. It would bend the law without breaking it, I think.
The flavor is after a battle, the generals collect the broken clay from the battlefield so they can make new Ushabti. How it translates mechanically can differ
The only one that sort of breaks the theme is , because green gets in on that sort of effect from time to time, and red doesn't really do it often, so it's mostly a blue ability. But the ability is non-white, the ability is not blue, the ability isn't really white (though making your opponent draw cards does make it feel like white is adding its influence), and the ability is far more than , if it's at all.
If that's the case, then your syntax needs to change. See Gild and Tolsimir Wolfblood: It has to read "Put a 3/1 red and white Shabti artifat creature token with haste named Unstable Shabti onto the battlefield." Otherwise, the game treats Unstable as a name and creature type for the token.
damage-kill seems both red or black, and discard draw cards is pretty red/black
jeez, I mean I'm open to suggestions, no need to be annoyed =/
Making it artifact creatures could work in red/black hybrid. Red gets artifact removal and Wheel of Fortune effects, while black gets creature removal and giving up one resource for another. Looting isn't black but drawing based on your graveyard should be.
I don't care about the flavor. You shouldn't break the color pie because of flavor. If it were all about flavor, there would be no color pie. Black doesn't destroy artifacts.
You could, perhaps, change it to "destroy all artifact creatures," and that would only feel strange without actually breaking the pie. It would bend the law without breaking it, I think.
The flavor is after a battle, the generals collect the broken clay from the battlefield so they can make new Ushabti. How it translates mechanically can differ
Blue/green gold, maybe. No single color gets both card draw and artifact removal.
In fact, this wouldn't fit in any hybrid that I can see.
Better. Now I realize, though, that it's not black at all. Black does not get artifact or enchantment destruction.
Woah! I do not think this is a properly red effect. That's a lot of card advantage for red.
I feel like this should be an "Incarnation" creature type instead of an "Avatar". Might be just me though...
The only one that sort of breaks the theme is
, because green gets in on that sort of effect from time to time, and red doesn't really do it often, so it's mostly a blue ability. But the 
ability is non-white, the 
ability is not blue, the 
ability isn't really white (though making your opponent draw cards does make it feel like white is adding its influence), and the 
ability is far more 
than 
, if it's 
at all.
If that's the case, then your syntax needs to change. See Gild and Tolsimir Wolfblood: It has to read "Put a 3/1 red and white Shabti artifat creature token with haste named Unstable Shabti onto the battlefield." Otherwise, the game treats Unstable as a name and creature type for the token.