What makes some of these Ultimatums so powerful is that they change the state of the game, often rapidly throwing you ahead of everyone else, and dont need too much setup beforehand
Protection cards like Coalition Honor Guard, Benevolent Bodyguard, and Shelter can help protect your unstoppable creature, and even if your creature is bested Monk Idealist can bring the Armadillo Cloak back and provide a body for it
(I know, ramping is not the best thing to do when you already have a lot of mana, but its better than nothing, and it also lowers your chances of drawing more lands.) Besides, these are artifacts, and there are plenty of ways to leverage them in other ways in the set
Chandra Nalaar The OG
There have been reports of people stealing Pokmon promotional cards from inside cereal boxes in stores as well as scalpers buying Pokmon Happy Meals for the card prize inside