Doomscizor, the Cold Shadow

Partner with Daigo, the Deadly
Shadow, Training, Double strike, Vigilance, Deathtouch,Cascade
Creatures that have menace have Double strike.
Creature you control have haste.
Whenever you deal damage to a player, draw 3
cards and add {b}{b}{b}.
You don't lose unspent mana as steps, phases and
turns end.
At the beginning of each end step, Doomscizor the cold shadow deals 3 damage to each player.