first foil mtg card Aetherdrift - Place Target player adds three mana of the chosen color for each artifact sacrificed this way. The Aetherspark (First-Place Foil)

If the artifact is three mana or less the Engineer will be all too happy to help you swap it into play if you dont have another option handy, and its the open ended synergy of that play sequence that has me seeing $$$ down the road

Brago, King Eternal Ah yes, Brago the Blink Machine

, Sacrifice this creature: When you next cast an instant or sorcery spell this turn, copy it for each time you've cast your commander from the command zone this game

From playing with the heroes such as Yuna, Wakka, and Auron, to even finding uses for the minor moments such as the traveling shopkeeper Oaka constantly asking you for money (though in MTG hes after your counters to exchange for drawing more cards)