I absolutely love the tech! Is there a particular reason you're not running
Reito Lantern? I don't see how otherwise
Mindslaver can be a win condition.
It also helps
Aetherflux Reservoir because you can keep recasting the same spells without running out of cards.
It could also have some niche utility in bringing back combo pieces that were put into a graveyard. Technically it also turns
Lotus Petal (which you don't have either) into a color filtering engine and
Mind Stone into a draw engine.
On that note I find it surprising you don't have
Grim Monolith and
Power Artifact as your backups. I'd be worried about someone exiling something important or - most likely - someone removes the
Isochron Scepter leaving
Dramatic Reversal exiled! I mean you've included some expensive cards already so I assume money is not an issue here.
Grim Monolith also helps with setting up other combos even if you never use it again. Three redundant infinite mana combos also makes mana filtering much more important.
To recap, that's four new cards:
Reito Lantern,
Lotus Petal,
Grim Monolith and
Power ArtifactEDIT:There's also a couple of options for infinite turns:
Nexus of Fate + 10 manaBeacon of Tomorrows + 11 mana
Temporal Manipulation /
Time Warp +
Reito Lantern + 11 mana
There are also two very unique protection spells that keep Dramatic Scepter intact:
Reality Ripple and
Vision Charm. Since Phasing happens on the battlefield
Isochron Scepter won't lose track of the imprinted instant. It also helps with
Proteus Staff since it's an artifact and a very important one, too. The upside is that the phased out permanent will stay phased out until your next turn, which means it evades all board wipes. Both are instants so it's fairly easy to tutor them in a pinch.
There is only one card that can target a phased out object and that's
Time and Tide and even it can't touch a phased out artifact. Phasing in is a state based action that happens during untap which also means you can't prevent objects from phasing in. There's a handful of cards that force you to skip your untap step and the two most
dangerous ones are
Stasis, Shisato, Whispering Hunger and
Sands of Time because they can prevent the untap step for a long time.
EDIT 2:I feel like the biggest weaknesses are: stuff like
Null Rod, stuff like
Pithing Needle,
Krosan Grip, and things like
Extract. There isn't an easy way to address them other than countering or bouncing. Sure, you could run your own
Extract to find their
Krosan Grip and
exile it but I feel like the safest approach is to have multiple ways to produce the win condition. I like it that you have a couple of win conditions that work against most strategies but there are very few ways to get there.
Also...
Helm of Awakening? Why not
Sapphire Medallion or
Semblance Anvil?
EDIT 3:I promise this is the last edit. I just thought of
Temporal Mastery. I know it's a single use spell, but since you get to stack your library every time you use
Proteus staff it might make sense to leave it as the top card for your next turn, giving you automatically a double turn to help pull off a combo.