Incandescent Soulstoke is a uncommon Creature — Elemental Shaman card from Modern Masters 2015 (MM2), collector number 119. Current market price: $0.35 (foil $1.96), TCGplayer market prices via Scryfall.
Other Elemental creatures you control get +1/+1. {1}{R}, {T}: You may put an Elemental creature card from your hand onto the battlefield. That creature gains haste until end of turn. Sacrifice it at the beginning of the next end step.