Dwarven Confluencer is a rare Creature — Dwarf card from Mystery Booster 2 (MB2), collector number 561. Current market price: $0.19, TCGplayer market prices via Scryfall.
{T}: Destroy target nontoken land. Its controller creates a Mana Confluence token. (It's a land with "{T}, Pay 1 life: Add one mana of any color.")