Sokenzan, Crucible of Defiance is a rare Legendary Land card from Kamigawa: Neon Dynasty Promos (PNEO), collector number 276p. Current market price: $3.20 (foil $3.18), TCGplayer market prices via Scryfall.
{T}: Add {R}. Channel — {3}{R}, Discard this card: Create two 1/1 colorless Spirit creature tokens. They gain haste until end of turn. This ability costs {1} less to activate for each legendary creature you control.