Here They Come...

Amass Orcs 10. Then if there are 3 or more
orcs on the battlefield under your control, you gain 5 life.

{u}{b}{r}{5}, sacrifice a creature: Look at the top
{x} cards of your library where {x} is the amassed army's power, put three of them onto the battlefield and the rest on the bottom of your library in a random order. Deal 5 damage to target player and create a 4/4 wall with defender.