Cluny, Whiptail Scourge

Vigilance
Whenever you cast a spell, amass
Rats X, where X is that spell's mana value.
(Put X +1/+1 counters on an Army you control.
It's also a Rat. If you don't control an Army, create a 0/0 black Rat Army creature token first.)

Rats you control Have First Strike

Cluny emphasizes the value of psychological warfare. He knows that demoralizing his enemies is more important than outmatching them in physical strength.