You cannot play Shiva, Lady of Frost or Card Name Ysayle while already in control of either Character
I also like the idea of using this as a combat trick in case someone comes your way, you can make a big powerful instant and then kill the attacking creature that came your way
Then you drop, for free, any number of creatures from your hand to the battlefield
Dog-tired and freezing, an involuntary smile pulls your face into a hopeful expression as you finally see it: a sign for the local inn
The Reaper is certainly a powerful Commander if you wrap your head around your -1/-1 strategy, but I do think Auntie Ools card draw is the more compelling feature, as you might even be able to draw The Reaper, and other synergistic cards, by exploiting your Ward/Blight abilities
Diminishing Returns is the first attempt at creating a "fixed" version of Timetwister