Boros Mid-range?

[Starr26]

Boros Mid-range? 61 cards, 0 sideboard 11 {Plains} 11 {Mountain} 2 {Boros Guildgate} 24 lands 3 {Firefist Striker} 4 {Bomber Corps} 3 {Soldier of the Pantheon} 2 {Purphoros, God of the Forge} 2 {Firemane Avenger} 1 {Brimaz, King of Oreskos} 4 {Rakdos Cackler} 1 {Flame-Wreathed Phoenix} 2 {Anax and Cymede} 22 creatures 1 {Ajani, Caller of the Pride} 3 {Martial Glory} 1 {Spear of Heliod} 2 {Chained to the Rocks} 1 {Elspeth, Sun's Champion} 2 {Pacifism} 3 {Lightning Strike} 2 {Assemble the Legion} 15 other spells Sideboard Notes:

[particle]

{boros charm} {warleader's helix} {spark trooper}.

[Starr26]

How many of each? Replacing what?