For Kaarga Warfang you've added 11 extra cards, but there are only two extra cards: Crowd's Favor and the Bloodsworn Colliseum text card. The rest of the Bloodsworn Colliseum cards replace what would have been regular villain cards.
Your numbers add up to 3,024, not 3,124. With the Kaarga Warfang collection, they'll add to 3,015.
For myself, I've been collecting the variants along the way, including the eight variant villain cards (four pairs of two each for Blade, Omnitron, Spite, and GloomWeaver), and since I plan to sleeve the Complete Hero Variant Collection (67) and the Foil Hero Correction (110), my total is 3,200.
- EE: 578 (41x10 + 27x4 + 15x4 = 410 + 108 + 60)
- RC: 222 (41x2 + 27x4 + 2/Operative + 15x2 = 82 + 108 +2 + 30)
- IR: 228 (41x2 + 27x4 + 8/Ennead + 15x2 = 82 + 108 +8 + 30)
- ST: 220 (41x2 + 27x4 + 15x2 = 82 + 108 + 30)
- Vengeance: 339 (41x5 + 4/Sentinels + 20x5 + 15x2 = 205 +4 + 100 + 30)
- WC: 224 (41x2 + 2/Sky-Scraper, 27x4 + 2/Kaargra + 15x2 = 82 +2 + 108 +2 + 30)
- Villains: 260 (20x10 + 15x4 = 200 + 60)
- OblivAeon: 340 (41x5 + 1/Guise + 25x4 + 5/Shield + 15x2 = 205 +1 + 100 +5 + 30)
- Mini-expansions: 537 (41x9 + 27x4 + 15x4 = 369 + 108 + 60)
- Variant Heroes: 68 (YL-1, RCW-1, Ra-1, Fanatic-1, DV-1, EH-1, F6-6, DWatch-4, GIL/B-2, SST-1, Prime Wardens-5, Knyfe-1, Kvothe-1, TNat-3, Santa Guise-1, SI-1, HN-1, CR-1, Se-5, Completionist-1, OU-1, Fugue-1, SSEx-3, CCI-1, VisUn-1, Lum-1, DWHarpy-1, Sgoodguy-1, S&D-1, A'T-1, Como-1, Lifeline-1, XtremePW-5, VGvariants-4, F5-5, Sunset-1)
- Variant Villains: 8 (Omni, BB, Spite, Gloom, 2 each)
NOTE: You could also add one more for Cleverest Legacy.