Bombadil's Song is a common Instant card from The Lord of the Rings: Tales of Middle-earth (LTR), collector number 605. Current market price: $0.42 (foil $0.77), TCGplayer market prices via Scryfall.
Target creature you control gets +1/+1 and gains hexproof until end of turn. The Ring tempts you. (A creature with hexproof can't be the target of spells or abilities your opponents control.)
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