Both commander choices are great for the deck, and unlike most cases, where there's a clear "best" commander, the choice between Tidus and Yuna is completely up to personal preference (although Yuna is the stronger of the two)
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature
That includes Lilo - Rock Star, Darkwing Duck - Cool Under Pressure, and Mulan - Resourceful Recruit

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The second new rarity is "Iconic." These will be rarer than Enchanted, likely making them the most valuable card type in the game moving forward
Knight of Autumn As soon as I saw Knight of Autumn I immediately said it would be one of the best cards in Guilds of Ravnica