Quicksilver Behemoth

Creature — Beast • Mana cost: {6}{U} • Darksteel • Common

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
When this creature attacks or blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)

Illustrated by Anthony S. Waters & Cara Mitten.