Defense Grid (BRR) #76 [EN/N] s/o

{2} · Artifact · Each spell costs {3} more to cast except during its controller's turn. · "Properly installed, each powerstone emits a targeted electromagnetic field that halts momentum as sure as stone." —*Tome of Obstructions* · Illustrated by Mark Tedin · The Brothers' War Retro Artifacts #76 · EDHREC rank 1883 · Magic: The Gathering, MTG