Stoneshock Giant is a uncommon Creature — Giant card from Theros (THS), collector number 142. Current market price: $0.03 (foil $0.36), TCGplayer market prices via Scryfall.
{6}{R}{R}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, creatures without flying your opponents control can't block this turn.