If you want to follow this route, it might be correct to bring in the third Counterspell over both Flusterstorms, compensating for this ninth nonexistent easy cut from the maindeck
In all seriousness, though, a panic button available to any deck is something to be wary of, and its appreciated that designers were mindful to limit the potential for annoying scenarios by making this legendary and having it exile itself on activation
Eventually we win the game by chaining together extra turns and pumping our weenie army
White weenie decks don't really have a use for all that extra mana should they fail to Armageddon, so trading two mana for one more point of damage each turn stands as a pretty fair bargain
For this reason, combo decks will typically ignore the opponents gameplan and focus on assembling their combo pieces to win
The first instant/sorcery you cast each turn costs one less for your Flood counters