look at the last ruling on the eldrazi that deals with cmc.
<3 ya wotc.
Saw that on Reddit, was going to post it here, got beat to it by Taysby. :/
The one that struck me most from void's rulings: no casting morphs with winnower on the field. That and morphs can't block.
Seems relevant in a standard including the Tarkir block.
(And did I mention any flipped cards won't be blocking either? Hi there {delver of secrets}!