Keldon Mantle is a common Enchantment — Aura card from Planeshift (PLS), collector number 65. Current market price: $0.15 (foil $2.57), TCGplayer market prices via Scryfall.
Enchant creature {B}: Regenerate enchanted creature. {R}: Enchanted creature gets +1/+0 until end of turn. {G}: Enchanted creature gains trample until end of turn.