This seems pretty sweet. I have really liked Garruk's Horde in lower powered environment and having it's effect stapled onto a creature half the cost is pretty sweet. Also pretty interesting that is says look at the top instead of reveal. Was Oracle of Mul Daya and Courser of Kruphix giving away too much information with their abilites (or just to save rules headaches with drawing multiple cards)?
That last ability is probably mostly just trinket text but could be useful in all those 5-colour pod decks I keep trying to build.
It is also really hard to tell what is a Naga and a snake these days. I want snake tribal to be a thing in cube