3
What are your favourite ex-Modern cards?
(mtgzone.com)
[[Nahiri, the Harbinger]] was a card I tried to jam into many brews. Great card and every ability was useful. I am not sure if she can be used in Wizards Tower however?
[[Mycosynth Lattice]] (+ [[Karn, the Great Creator]] ) Essentially a 1-card combo that makes your opponent unable to tap anything (including lands) on the board.
Modern format discussion
Modern is a non-rotating format that allows all cards that have been printed in a core or expansion set from the origination of the modern card, or 8th Edition. Additional supplemental sets printed specifically for Modern are also allowed.
Read more at Modern's official website.