While Blue control players would usually keep mana in reserve for their opponent's turn, Force of Will meant they could use all their mana on their turn casting spells and still be able to counter whatever spells their opponent attempted to cast.
However, knowing which Promo cards you are missing from your set, as well as which cards came from which packs, can be somewhat confusing from time to time
The main reason was and is to retain the value of those cards on the secondary market
MEGA-era box prices range from $73 (Nihil Zero) to $90 (Ninja Spinner pre-order)
This deck is themed on the nature of power and how willing people are to attack our neighbors for small crumbs of advantage while those with the most power gain exponentially more from that action over time and eventually sell us out
It hits hard, it hits right away, it is massive, it has all the right evasion and it even has some mild ability to protect itself