The most common removal spells in Modern are Unholy Heat, Lightning Bolt, Solitude and Prismatic Ending, all of which Phyrexian Crusader is immune to
And do keep in mind, you will need a deck box designed to hold 100+ double-sleeved cards
Im a big fan of cycling lands, as they help mitigate flooding
What's more is that even without the four counters, it can still get in small points of damage and also block well
However, as people played the card more and more, they realized that casting a small Sphinxs Revelation for two or three would gain them the life and give them the cards they needed to prolong the game a little later, in which case they would want another Sphinxs Revelation for five or six
This deck goes very wide, and it doesnt have to rely on opponents to ensure it costs just 2 white mana to cast