WOW!!! Just WOW!!!. This thing makes Woolly Thoctar look Anaemic.
Losing 2 power gains it 3 keyword abilities with no change in cost. Can I have lots of please ?
It's a nice card just probably a little undercosted/overpowered. Nice continuation of the 3 colour 3 cost Thoctar theme

Yeah, it's probably too strong, even losing 2 power and 1 toughness.

I don't see vigilance in anything but white, maybe blue (see Serra Sphinx).

Vigilance is tertiary in green these days; see Beacon Behemoth, Chancellor of the Tangle, Joraga Bard, Snapping Creeper, and a handful of others. My thought was that all those abilities are more green than red or black; black perhaps has equal claim on deathtouch, but none of them are red at all (red gets occasional trample, but it's much more a green than a red ability).