The only reason Unholy Heat isnt higher on this list is that it doesnt see as much play as it used to
Sure, it will still see a little casual play, and maybe Pod enthusiasts will turn their sights to Legacy and see what can be done there, but for the most part, we're looking at a brave new world the likes of which we haven't really imagined since May of 2011
If this Pokemon has at least 1 extra Energy attached to it (in addition to this attack's cost) , prevent all effects of attacks, including damage, done to it during your opponent's next turn
This is a bit of a rectangles and squares situation though, because damage causes life loss for cards like Bloodletter of Aclazotz and Wound Reflection
As long as it has at least one time counter on it, it isn't a creature
The fact that it needs colorless mana can be useful in archetypes that require access to other colors, but are predominantly green, such as Titan Field and Golgari Yawgmoth, and its ability can give it space in Domain Zoo to amplify the clock