Gunmar, The Trapped

+1: give your trolls +1/+1, and all your other creatures -1/-1
-2: Summon a 3/3 Gumm-Gumm token. Gumm-Gumms gain half the bonus (rounded up) of buff spells (or abilities).
-6: Put The Decimar Blade on the battlefield, only use this if Bular, son of Gunmar is in the graveyard. Transform Gunmar, The Trapped.