The Mechanist, Aerial Artisan [Avatar: The Last Airbender] Duels of the Planeswalkers Promos 2013 Set: Outlaws of Thunder Junction:

Set: Outlaws of Thunder Junction: The Big Score Type: Artifact — Clue Rarity: Mythic Cost: {2}{U} Whenever you sacrifice Esoteric Duplicator or another artifact

"These benighted worlds are thick with ignorance

Exile The Stone Brain: Choose a card name

Set: The Lost Caverns of Ixalan Type: Legendary Creature — Human Soldier Rarity: Rare Cost: {1}{R}{W} Whenever you attack with one or more non-Gnome creatures

and Tieflings you control get +1/+1 and have lifelink

The Mechanist, Aerial Artisan [Avatar: The Last Airbender] Duels of the Planeswalkers Promos 2013 Set: Outlaws of Thunder Junction:Set: Avatar: The Last Airbender Type: Legendary Creature Human Artificer Ally Rarity: Rare Cost: {2}{U} Whenever you cast a noncreature spell, create a Clue token. (It's an artifact with "2, Sacrifice this token: Draw a card.") T: Until end of turn, target artifact token you control becomes a 3 1 Construct artifact creature with flying. "We're just in the process of improving upon what's already here."