At the beginning of your upkeep, sacrifice Gurzigost unless you put two cards from your graveyard on the bottom of your library. {G}{G}, Discard a card: You may have Gurzigost assign its combat damage this turn as though it weren't blocked.
Protection from black Threshold — Nantuko Blightcutter gets +1/+1 for each black permanent your opponents control as long as seven or more cards are in your graveyard.
{G}, {T}, Sacrifice Nantuko Calmer: Destroy target enchantment. Threshold — Nantuko Calmer gets +1/+1 as long as seven or more cards are in your graveyard.
Trample Threshold — As long as seven or more cards are in your graveyard, Possessed Centaur gets +1/+1, is black, and has "{2}{B}, {T}: Destroy target green creature."