Space Series - Planet | Mega Planet

[xray1324]

NAME: Planet ELEMENT: Gravity COST: 5 TYPE: Creature ATK|HP: 5 | 15 TEXT: Orbit: This card is put on the permanent slot/creature slot.	NAME: Mega Planet ELEMENT: Gravity COST: 7 TYPE: Creature ATK|HP: 8 | 20 TEXT: Orbit: This card is put on the permanent slot/creature slot.

ART: IDEA: Xray1324 NOTES: Planet becomes a useless permanent with the orbit skill on its use, and back to creature on permanent use. SERIES: Space Series

[kaempfer13]

should start as a permanent to make it a high def graboid; its skill is also usefull together with Catapult, so you are only weak to pc and not hard cc as well. As is its just a slightly op vanilla creature with a rarely useful ability.
A completely different approach would be to make it change constantly/randomly

[Aves]

Needs a slight nerf; it is strictly better than existing cards in addition to the new mechanic you're suggesting.