Unfathomable Truths is a common Instant card from Modern Horizons 3 (MH3), collector number 77. Current market price: $0.22 (foil $0.30), TCGplayer market prices via Scryfall.
Devoid (This card has no color.) Draw three cards and create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this token: Add {C}."