Prison Barricade is a common Creature — Wall card from Invasion (INV), collector number 25. Current market price: $0.10 (foil $0.47), TCGplayer market prices via Scryfall.
Defender (This creature can't attack.) Kicker {1}{W} (You may pay an additional {1}{W} as you cast this spell.) If this creature was kicked, it enters with a +1/+1 counter on it and with "This creature can attack as though it didn't have defender."