This deck features 20+ counterspell spells (instants), and in addition a number of your creatures add additional counter abilities, such as Voidmage Prodigy, which can turn each of your wizards into a counterspell
You've got 40 creatures (aside from your commander) and 39 lands to ensure a decent opening hand
On her own, shes already annoying, a two-turn Dig Through Time glued to a three-mana planeswalker
Being an unblockable creature with the potential of doing three damage each combat, just leaving the mana up can be enough to scare an opponent into acting - even if activating them is a little expensive
When a regular pack of cards won't suffice, the Internet will
The design of five color generals has changed so substantially over the last few years that I believe that a ban like this was inevitable