Interplanar Beacon is a uncommon Land card from War of the Spark (WAR), collector number 247. Current market price: $0.19 (foil $1.35), TCGplayer market prices via Scryfall.
Whenever you cast a planeswalker spell, you gain 1 life. {T}: Add {C}. {1}, {T}: Add two mana of different colors. Spend this mana only to cast planeswalker spells.