As a bystander to the format, I can say that before Modern existed, the Extended formatwhich encompassed anywhere between the previous 4-7 years of Magicwas much maligned
Its ability to give our creatures evasion is one that this deck really needs, and the fact that its easier to cast than Embercleave is another huge point in its favor
Smothering Tithe Smothering Tithe is probably the most famous instance of a taxing card
The easiest way to determine if your deck belongs in bracket four or five is that four is an optimized commander deck, while five is a deck you would bring to a tournament with the intention to win
Recruit a trusted partner and fight shoulder-to-shoulder, hand-in-hand, or back-to-back for glory and the roar of the crowd
Of course pairing either the Cavalry or the Behemoth with Blue does the trick, but I think its a valid point for mono-White decks to consider