Emaki

Vigilance, Double Strike, Trample
Pay {2} for Emaki to attack. Add a counter to Emaki
{t}: Sacrifice all counters, Emaki deals X damage to All creature all opponents control
{5}{w}{b}: Untap Emaki

Tranquillity is courage in repose. It is a statical manifestation of Valor, as daring deeds are dynamical.