It has been a very long time since there was a magic expansion, which I really became excited over like invasion. It is a fresh breath from the past, full of Visions and Mirage. It has seemed that since weatherlight the Wizards design team has had something against Boldoesque decks.
Invasion is full of locking cards of all types as well as many mana-making favorites.
One of the best things is the choice of reprints, which are not the same old boring set. Sure there is Tranquility, but also Shackles, Soul Burn, Harrow, Fertile Ground, and Quirion Elf besides the numerous reprints under a different name like Chromatic Orb, and Horned Troll. Finally I just love gold cards and the mirage block concept of taking two cards and making them into one card makes for perfect gold. Spreading Plague a cool creature control card with many abuses combined with creature creators. 9 Quirion Trailblazer is Yavimaya Granger without echo and every deck I played had the granger.