Erratic Cyclops is a rare Creature — Cyclops Shaman card from Guilds of Ravnica (GRN), collector number 98. Current market price: $0.15 (foil $0.34), TCGplayer market prices via Scryfall.
Trample Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value.