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Am a big fan of graveyard shenanigans decks (can see mine here - Fungus, Among'us - The Mycotyrant, Dredge-King) however
If some other player has some engine out that doesnt involve creatures, they love this plane and want to stay here forever while everyone else is scrambling to roll the planar die as fast as they possibly can
This can come back pretty cheaply, and Black/Red (which likes spells) and Black/Green (which likes the graveyard) can probably take advantage of it
An investment of just two mana doubles the effectiveness of any morph, and it's just a single mana to move it between different colorless creatures once in play
If youre dodging a sweeper, protecting your whole board is well worth the disadvantage, and if youre just sidestepping single-target removal, you dont need to give the gift away in the first place