Patron of the Akki is a rare Legendary Creature — Spirit card from Betrayers of Kamigawa (BOK), collector number 115. Current market price: $0.46 (foil $1.96), TCGplayer market prices via Scryfall.
Goblin offering (You may cast this spell any time you could cast an instant by sacrificing a Goblin and paying the difference in mana costs between this and the sacrificed Goblin. Mana cost includes color.) Whenever Patron of the Akki attacks, creatures you control get +2/+0 until end of turn.