Potential is what I was looking at. I understand where you're coming from though, there are a lot of flaws that still need ironing out but I wanted to lay the groundwork.
As for Time Space Library, I was thinking the same, I'm reworking a lot of the cards and that was on the top of my list. I'm leaning more towards a quick play spell "You and your opponent may add up to 5 banished cards to your respective GY. This card is Banished after this effect resolves." It could also work really well with some other archetypes as well, for example: Gizmek Orochi, the Serpentron Sky Slasher into Gi