This is a pretty annoying card with powerful abilities, but it sits between a rock and a hard place between what it wants to do. As a single threat hexproof threat, Carnage Tyrant is generally the better option since it's uncounterable, has trample, and doesn't rely on other creatures to get the full value out of it. As a +1/+1 matters enabler / payoff, it's generally worse than Vorniclex, Monstrous Raider. Tovolar's Huntmaster creating its own threats is more appealing to me than adding +1/+1 counters to other creatures.
My High Octane Unpowered Cube on CubeCobra