Interplanar Beacon is a uncommon Land card from Commander Masters (CMM), collector number 1004. Current market price: $0.22, 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.