In fact, theyve done this twice already
For example, if you control ten permanents, lose control of one, then planeswalk to The Golden City of Orazca, you won't have the city's blessing
She is also a part of a two card infinite combo with Scurry Oak, that results in infinite creature tokens, infinite +1/+1 counters on Scurry Oak and infinite ETB
Altar of Bhaal Amethyst Dragon Animating Faerie Aquatic Alchemist Ardenvale Tactician Beanstalk Giant Beanstalk Wurm Bellowing Bruiser Beluna Grandsquall Beluna's Gatekeeper Besotted Knight Blessed Hippogriff Bonecrusher Giant Bramble Familiar Brazen Borrower Brightcap Badger Callous Sell-Sword Candlekeep Inspiration Chancellor of Tales Cheeky House-Mouse Colossal Badger Conceited Witch Cruel Somnophage Crystal Dragon Curious Pair Decadent Dragon Devouring Sugarmaw Dread Linnorm Edgewall Inn Edgewall Innkeeper Elusive Otter Embereth Shieldbreaker Emerald Dragon Ettercap Fae of Wishes Faerie Guidemother Fang Dragon Fell Horseman
At first blush, at least, Prototype has the hallmark of a solid keyword in that its reasonably simple to understand at a glance while simultaneously expanding the branches of your in-game decision tree in interesting ways
