The Rex Angelus Sanguis

Haste, Flying, Double strike
Battalion- Whenever Rex Angelus Sanguis and at least two other creatures attack, draw a card.
Noncreature spells with converted mana cost 2 or lower can't be cast.
{2}{r/w}:Search your library for a permanent card with converted manna cost 4 or less and put it into your hand, then shuffle your library.