Rules
Card sleeves are considered part of the card. If the thrown card (or its own card sleeve) touches Dart Throw’s sleeve, it is considered to be touching Dart Throw.
Check whether the thrown card touches Dart Throw after it stops moving. If it touched Dart Throw but came to rest not touching it, that’s a miss.
No player may interfere with the throwing of the card, including while it’s in flight.
The card you throw must be a traditionally sized Magic card. It can be in a card sleeve if you’d like, but it can’t be otherwise modified. It must be thrown onto the battlefield from at least three feet (about one meter) away horizontally.