Cheapest priced copy (Darksteel): $0.49 at Card Kingdom, near mint, their price list as of .
Pulse of the Grid 
Instant · Rare · Darksteel · #29
Draw two cards, then discard a card. Then if an opponent has more cards in hand than you, return Pulse of the Grid to its owner's hand.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper