Gnomeball Machine — ruling 1

Contraptions are artifacts. Anything that interacts with artifacts will interact with Contraptions.

Gnomeball Machine — ruling 2

Contraptions aren't put into your main deck. They go into a separate deck called the Contraption deck.

Gnomeball Machine — ruling 3

In Constructed formats, a Contraption deck must have at least fifteen different Contraption cards and no more than one of each.

Gnomeball Machine — ruling 4

In Limited formats, a Contraption deck may include any number of Contraption cards in your card pool. You don't have to include every Contraption card you draft or open in sealed deck. In those formats, your Contraption deck may include duplicates.

Gnomeball Machine — ruling 5

In silver-bordered games using Contraptions, you have three sprockets, illustrated on the back of Contraption cards. At the start of the game, put a CRANK! counter on sprocket 3.

Gnomeball Machine — ruling 6

While Contraptions you control are on the battlefield, the Contraption deck is not, even if you are using it to signify the three sprockets.

Gnomeball Machine — ruling 7

If you or a permanent you control are instructed to assemble a Contraption, reveal the top card of your Contraption deck. Put it onto the battlefield on one of the three sprockets.

Gnomeball Machine — ruling 8

At the beginning of your upkeep, if you control any Contraptions, move the CRANK! counter to the next sprocket. You may then crank any number of Contraptions on that sprocket, causing their abilities to trigger. Cranking a Contraption is always optional.

Gnomeball Machine : règles, fonctionnement et interactions (MTG)

Gnomeball Machine is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever you crank this Contraption, create two 1/1 colorless Gnome artifact creature tokens.

How it works : Gnomeball Machine

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
Contraptions are artifacts. Anything that interacts with artifacts will interact with Contraptions.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
Contraptions aren't put into your main deck. They go into a separate deck called the Contraption deck.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
In Constructed formats, a Contraption deck must have at least fifteen different Contraption cards and no more than one of each.
No other card is named in this ruling.
#4January 19, 2018· Wizards of the Coast
In Limited formats, a Contraption deck may include any number of Contraption cards in your card pool. You don't have to include every Contraption card you draft or open in sealed deck. In those formats, your Contraption deck may include duplicates.
No other card is named in this ruling.
#5January 19, 2018· Wizards of the Coast
In silver-bordered games using Contraptions, you have three sprockets, illustrated on the back of Contraption cards. At the start of the game, put a CRANK! counter on sprocket 3.
No other card is named in this ruling.
#6January 19, 2018· Wizards of the Coast
While Contraptions you control are on the battlefield, the Contraption deck is not, even if you are using it to signify the three sprockets.
No other card is named in this ruling.
#7January 19, 2018· Wizards of the Coast
If you or a permanent you control are instructed to assemble a Contraption, reveal the top card of your Contraption deck. Put it onto the battlefield on one of the three sprockets.
No other card is named in this ruling.
#8January 19, 2018· Wizards of the Coast
At the beginning of your upkeep, if you control any Contraptions, move the CRANK! counter to the next sprocket. You may then crank any number of Contraptions on that sprocket, causing their abilities to trigger. Cranking a Contraption is always optional.
No other card is named in this ruling.
#9January 19, 2018· Wizards of the Coast
If you crank multiple Contraptions, their abilities can be put onto the stack in any order. The ability put onto the stack will resolve first.
No other card is named in this ruling.
#10January 19, 2018· Wizards of the Coast
If a Contraption would leave the battlefield and go to any zone other than exile, it instead goes to the scrapyard, the Contraption deck's version of the graveyard. Things that affect the graveyard do not affect the scrapyard. You can exile Contraptions just fine.
No other card is named in this ruling.
#11January 19, 2018· Wizards of the Coast
If you or a permanent you control assembles a Contraption and your Contraption deck is empty, nothing happens. You don't lose the game.
No other card is named in this ruling.
#12January 19, 2018· Wizards of the Coast
Any Contraption that's on the battlefield and wasn't assembled immediately heads to the scrapyard. However, if it's a not an actual Contraption card (like Copy Artifact isn't), it goes to your graveyard as normal. Non-Contraption cards can't be in the scrapyard.
No other card is named in this ruling.