This mechanic interestingly enough was the original one I designed for Odyssey' s Mirari before the rules team told me that it would never work
Nasty fun times, commence
Start by playing the deck, learn what your commander wants to do, then make a few focused upgrades at a time
As a sorcery, you may pay the mana cost of a locked door to unlock it.) Enchantment - Room Rooms (CTRL to add secondary) Targeted Removal Cramped Vents When you unlock this door, this Room deals 6 damage to target creature an opponent controls
I guess you could combine this with Freed from the Real or something in Modern, but even then your engine isnt infiniteyoud have to pay 1UR every time you wanted to make a copy of something, which isnt even as good a deal as Fated Infatuation
you have to find ways to get extra cards to have any sort of advantage over your opponents