At six ink, this is one you'll need to be absolutely sure you can win with before playing, but with your illusions often having high stats, and a large number of challengers in the deck, taking out any opposition should be pretty easy
[4] [20] Wizards of the Coast initially stated that they would not be Standard legal
It offers a taste of the formats creativity without requiring the full fourplayer environment
In artifact ramp decks, especially with Karn, Legacy Reforged, it comes down earlier than expected and creates huge pressure
The logic is this: your deck should be able to do things at every point in the game
It's an amazing card, but the six-mana cost means itll likely only see play in Commander