Signal Pest is a uncommon Artifact Creature — Pest card from Mirrodin Besieged (MBS), collector number 131. Current market price: $0.36 (foil $8.52), TCGplayer market prices via Scryfall.
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.) This creature can't be blocked except by creatures with flying or reach.