Patron of the Akki is a rare Legendary Creature — Spirit card from The List (PLST), collector number BOK-115. Current market price: $0.25, 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.