Modern noob

Replace Gruul Turf with Rootbound Crag.  You also have no white mana generation, so Call of the Conclave should be cut.  Creakwood Liege is good, but outside of the tokens he generates, he's not really helping you out all that much, so I'd say he's expendable.  Same goes for Rise of the Hobgoblins. I would suggest Llanowar Elves or Birds of Paradise for mana ramp (not to mention one-drop chump blockers if needed...especially since the Birds give flying defense too).  You'll need the mana later on anyway, so you should consider it.  Also, this deck is screaming for Sprout Swarm, especially since you can simply tap creatures to pay for it with the buyback, making it a freebie.  I would also consider possibly adding Doubling Season, even if it's only two copies, just to make it more likely that you'll pull the double-token effect, but that's not really necessary.

I don't know if it would be tournament-calibre...there's definitely a few tweaks that would be needed, but in casual Modern play I'm sure it'll hold it's own.