Interplanar Beacon is a uncommon Land card from The List (PLST), collector number WAR-247. Current market price: $0.29, 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.