Elemental Resonance is a rare Enchantment — Aura card from Dissension (DIS), collector number 83. Current market price: $2.67 (foil $11.70), TCGplayer market prices via Scryfall.
Enchant permanent At the beginning of your first main phase, add mana equal to enchanted permanent's mana cost. (Mana cost includes color. If a mana symbol has multiple colors, choose one.)