This elegant partnership transforms a humble elemental into a self-sustaining engine. By using Unctus, Grand Metatect's ability to turn Tidewater Minion into a blue artifact, you unlock the minion's true potential; because Unctus grants all other blue creatures the ability to draw and discard whenever they become tapped, tapping Tidewater Minion to target itself with its own untap ability immediately triggers the loot effect. Resolving that untap readies Tidewater Minion to repeat the process indefinitely, cycling through your entire deck while filling your graveyard at will.