This card is pretty nice, albeit it works better late game. The Threshold mechanic is one of my personal favourites since it requires more strategic play (trust me, sometimes it's hard to get those 7 cards in your graveyard). What I really like about this card's Threshold ability is that it's like Triumph of the Hordes, except without that stupid Infect thingy. On it's own, it's a 4/4 hasty trampler for 4 which is pretty good on its own, but it also increases the power of everything else you own and turn everything into a trampler. It's a good card, but only really when used when you have Threshold.
Pros: Less stupid Triumph of the Hordes, 4/4 hasty trampler for 4 with Threshold
Cons: Only really works with Threshold