Appeal to Eirdu is a common Instant card from Lorwyn Eclipsed (ECL), collector number 5. Current market price: $0.08 (foil $0.18), TCGplayer market prices via Scryfall.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) One or two target creatures each get +2/+1 until end of turn.