Skaven, the Never Missing

Deathtouch, Doublestrike, Trample, Hexproof, Regenerate {b}
{b}: Create a 1/1 rat with Deathtouch. You gain one life.
{x}{b}: Put X +1/+1 counters on each rat you control.
{10}{b}{b}: Search your library, graveyard and exile for any number of rat creatures and cast them without paying their mana costs.