Nightmare of Mensis

{t}: Add {c} to your mana pool as long as Nightmare of Mensis is a land.
{2}{c}{c} Nightmare of Mensis becomes a colorless 0/7 Great One creature with defender.
Frenzy - At the beginning of each upkeep, each non-Great One creature gets a frenzy counter. Deal 1 damage to those creatures for each frenzy counter on them.