Necrogen Mists [Mirrodin] SM38 If this face-up Fusion Summoned

If this face-up Fusion Summoned card in its owner's control leaves the field because of an opponent's card effect: You can Special Summon 1 "Ultimate Ancient Gear Golem" from your Extra Deck

When that target leaves the field

This effect can only be used once while this card is face-up on the field

If this Set card is sent from the field to the Graveyard: You can target 1 Level 10 Machine-Type monster in your Graveyard

then Set it in your Spell & Trap Card Zone

Necrogen Mists [Mirrodin] SM38 If this face-up Fusion SummonedSet: Mirrodin Type: Enchantment Rarity: Rare Cost: {2}{B} At the beginning of each player's upkeep, that player discards a card. Mephidross filled with roars of fury and wails of despair as the leonin fought to keep their memories from being pulled into the mists.