While most players understandably prefer their creatures to simply have it as a static ability and generally shy away from using temporary invulnerability due to expensive activation costs, this creatures means of self-preservation is much more palatable
The mana value of a prototyped card carries over once that permanent is in play
Curse of Opulence and Curse of Bounty are my favorites
Mog, Moogle Warrior* Little Mog from the Final Fantasy 6 Commander Deck is an interesting Group Hug type of card, that lets everyone loot, and making you little moogles and growing them all up, just like your own little moogle breeding center
Legendary Creature - Elemental Octopus Finisher (CTRL to add secondary) Protection Protection (CTRL to add secondary) Ramp Keeper of the Accord At the beginning of each opponent's end step, if that player controls more creatures than you, create a 1/1 white Soldier creature token
With that said, the ability to shut down and minimize every single creature in the game is nothing to scoff at