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Rosewater doesnt confirm anything in his response here, but usually his answers like this do end up panning out

[226] They later released an expansion Battle for Zendikar featuring multi-color Planeswalkers Kiora and Ob Nixilis and a colorless Eldrazi Ruiner, and a second master set Shadows Over Innistrad which has 4 new Planeswalkers and also includes the addition of cryptoliths

Massive card advantage spells start to become more important when you have things like Academy

The biggest looser The Wretched, is a card that was reprinted in Chronicles, and wasn't saved by the reserved list as many other cards were

If you are looking for something less high fantasy in style, you can always find scans from different card games - Card Game Database is a good starting point