Contraption

Contraption is an artifact subtype introduced in Future Sight with Steamflogger Boss, and expanded upon in Unstable.

To remind you that they shouldn't be put into your regular deck, Contraption cards have a unique card back.

Description
All Contraptions are artifacts that begin the game in the Contraption deck until they get assembled. Assemble, reassemble and crank are keyword actions associated with this mechanic. When a Contraption gets assembled or reassembled, it is put on the battlefield face up onto one of the player's three sprockets. The back face of a Contraption, and thus the top card of the Contraption deck, indicates which of the three are sprockets the contraption is placed on. The Contraptions can be assembled by players or Riggers.

At the beginning of your upkeep, you move the CRANK! counter one spot to the right, and sprocket 3 goes back around to sprocket 1. When it is moved, any number of Contraptions that were placed on that sprocket can be cranked. Contraptions have a triggered ability that triggers when you crank them. You choose the order in which Contraptions are cranked each time you move the CRANK! counter.

If one of the Contraptions would go to the graveyard, it's placed into the scrapyard instead, a special zone reserved for broken Contraptions.

Contraptions have a watermark placed in the bottom right-hand corner to show which Unstable faction they belong to. They are borderless, so they could potentially be used in black border one day. However, because of the different card back, they are currently not Legacy legal.

History
It was stated by Aaron Forsythe that Contraptions were meant as a joke. His statement ensured that players wanted it and they bugged Mark Rosewater about it ever since. Thus, Rosewater vowed to figure out contraptions' design before he would retire.

Kaladesh seemingly fitted the right circumstances for contraptions, but Rosewater argued against it. Contraptions finally got done properly in Unstable, as revealed by Mark Rosewater at SDCC 2017. The design of Unstable predated Kaladesh.

Rules
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Contraption deck
The Contraption deck is the collection of Contraption cards that a player plays with.
 * In Limited, you may play with whatever combination of Contraptions you open or draft. You're not required to play them all and you can play duplicates.
 * In Constructed, you must play a minimum of fifteen Contraptions and you may only have one of each.
 * In Commander, Contraptions do not count as a part of the 100 cards deck.