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
It offers a taste of the formats creativity without requiring the full fourplayer environment
Dion, Bahamut's Dominant is one of the main characters in Final Fantasy XVI, and one of the many named Final Fantasy characters given a card in Magic: The Gathering's Final Fantasy crossover set
It's an amazing card, but the six-mana cost means itll likely only see play in Commander
If a player does, counter that spell
The logic is this: your deck should be able to do things at every point in the game