Blood Ravens(dawn of war) vs Run the Xeno purging Guanlet
I'm pretty sure the Blood Ravens are allowed as they are game only chapter.
Rules: They are lead by Gabriel and he start with 25 Spacemarines(with random weapons and force commanders backing them) and 25 assault Marines, making a total of 51 marines. He replenish his forces after every fight. If he has trouble, a fully equipped Force Commander Merrick can aid him.
1. 100 random Necromorphs
2. 150 Flood(grave mind is in play)
3. 170 random space pirates(Metroid)
4. 150 random Zerg
5. OMG A BOSS Battle: They fight a normal Ridley
6. OMG ANOTHER BOSS: They fight the queen of Blades.
7. 1000 Space Pirates