code-gorilla asked: Since the introduction of planeswalkers, each block has (at least) one change from the basic planeswalker formula. Alara had the first multi-colored ones, Zendikar had a four ability planeswalker, an all minus planeswalker, and a planeswalker without an ultimate. Scars of Mirrodin sported the first colorless planeswalker, and Innistrad had a double-faced planeswalker. Is this a coincidence, or is it a conscious decision on R&D's part? And if it is a conscious decision, should we expect more?

You’ve cracked our secret of constantly innovating. : )

Yes, we’ll continue.