Clues: 3
ST14-02 SR Digimon Lv.3 Alternative Art Impmon Color Purple Cost 3 DP 1000 Digivolve Cost 1 Purple 0 from Lv.2 Form Rookie Attribute Virus Type Evil Card Text 1 [Effect] [When Attacking] If you have 20 or more cards in your trash, this Digimon may digivolve into [Beelzemon] in the trash for a digivolution cost of 3, ignoring digivolution requirements
When his opponents fall into his trap he shows his real self and defeats them cruelly, going so as far as to keep attacking his opponents even if they have no Life Points and claiming his fanservice must continue
To recap: the Metalfoe monsters provide triggers for Light, they provide Special Summon potential (through Pendulum summoning) for Water and Dark, and lastly, they provide the boss monsters
But take all the Human Hybrids (11), add all the Beast Hybrids (22), the six fusion Hybrids (28), as well as KaiserGreymon and MagnaGarurumon (30), that's two left over