Fangorn, Tree Shepherd 
Legendary Creature — Treefolk
Treefolk you control have vigilance.
Whenever one or more Treefolk you control attack, add twice that much .
You don't lose unspent green mana as steps and phases end.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL