You just dont know which
Really fun ones like Sinkhole and Hymn to Tourach
The overall setting for Warhammer 40,000 includes many of the more typical tropes of fantasy like humans, elves, and orcs fighting each other, big and epic battles, plus aliens and space technology
With more and more Treasure support seeing print, Revel in Riches definitely sees the most widespread play out of these 4 cards today (primarily due to its alternate win condition), but all are potentially great options for decks that kill a lot of opposing creatures, sacrifice their own, or do a healthy mix of both
This phase is where you want to play a Digi-Egg Card in the Breeding Area
Its also really good at dealing with problematic boss monsters thanks to its effect by sending a fusion monster that lists Fallen of Albaz as one of its materials to the graveyard, you can banish one monster on the field