The best way to build your collection and hunt for those rare foil variants is with a booster box
Both of these have occurred in Magic before but haven't been used very much
The most common removal spells in Modern are Unholy Heat, Lightning Bolt, Solitude and Prismatic Ending, all of which Phyrexian Crusader is immune to
This deck goes very wide, and it doesnt have to rely on opponents to ensure it costs just 2 white mana to cast
Haste makes it easy to drop at any point in the game, and gives you more incentive to declare attacks with the rest of the team
Also, this gives you, dear reader, the opportunity to take this list, Mark's list, or an amalgam of both lists as a starting point and upgrade it as much as you like