I am surprised that I never put graft and infect together in mono-green. The ability to deal ever greater damage against a smaller target (10 poison counters versus 20 life), all while reducing any blockers, makes this a solid plan. having a full complement of Glistener Elf does help, of course. Any problems are likely to arise from the balance between the two key elements and the touch of proliferate I have included to power it further on If I look to a second version, Ring of Kalonia would be worth considering, as adding more trample and more counter growth seems like a good idea. I could easily drop something like Mutant's Prey or Hindervines to make room for the one copy I own. The 16/8/4/7/0/5 curve averages a hefty 2.55, but mana enhancements and a strong low end help balance things out.