They work well along with a Predaplant engine as well, due to them having their own Polymerization clone, and being DARK as well, and many cards allow them to spam the field with monsters as well, though their main strategy is to get one of their own Fusion Monsters on the field by using either all monsters with the same name, or monsters with different names to get a bonus that blows up all monsters that aren't a specific kind of monster, which will make you able to get a lot of Feast Counters on Devourer Feast.
Original Card:
When this card battles a Fusion Monster, the ATK of the Fusion Monster becomes 0 during the Damage Step only.
New Cards:
Main Deck Monsters:
Synchro Devourer
Fiend/DARK
Level 4
If this card battles a Synchro Monster, that monster's ATK becomes 0 during the Damage Step only. You can discard this card; add 1 "Fusion Devourer" from your Deck to your hand. You can only use this effect of "Synchro Devourer" once per turn.
1400/1200
Xyz Devourer
Fiend/DARK
Level 4
If this card battles an Xyz Monster, that monster's ATK becomes 0 during the Damage Step only. You can discard this card; add 1 "Synchro Devourer" from your Deck to your hand. You can only use this effect of "Xyz Devourer" once per turn.
1400/1200
Link Devourer
Fiend/DARK
Level 4
If this card battles a Link Monster, that monster's ATK becomes 0 during the Damage Step only. You can discard this card; add 1 "Xyz Devourer" from your Deck to your hand. You can only use this effect of "Link Devourer" once per turn.
1400/1200
Extra Deck Monsters:
Deck Devourer
Fiend/DARK/Fusion
Level 8
2 "Devourer" monsters
If this card is Fusion Summoned using "Devourer" monsters with the same name: Destroy all monsters on the field Special Summoned from the hand or Main Deck. If this card battles a monster that was Special Summoned from the hand or Main Deck, that monster's ATK becomes 0 during the Damage Step only. When this Fusion Summoned card is destroyed by your opponent's card (by battle or card effect) and sent to the GY: You can add 1 "Devourer" Spell/Trap from your Deck to your hand.
2000/2000
Extra Devourer
Fiend/DARK/Fusion
Level 12
3 "Devourer" monsters
If this card is Fusion Summoned using "Devourer" monsters with different names: Destroy other monsters on the field Special Summoned from the Extra Deck. If this card battles a monster that was Special Summoned from the Extra Deck, that monster's ATK becomes 0 during the Damage Step only. When this Fusion Summoned card is destroyed by your opponent's card (by battle or card effect) and sent to the GY: You can add 3 "Devourer" monsters with different names from your Deck to your hand.
2500/2500
Spells/Traps:
Redevourer
Normal Spell
Target 2 "Devourer" monsters in your GY; add them to your hand. During your Main Phase, except the turn this card was sent to the GY: You can banish this card from your GY, then target 3 "Redevourer" cards in your GY; shuffle them into your Deck, then draw 1 card. You can only activate 1 "Redevourer" per turn.
Devourer Polymerization
Normal Spell
Fusion Summon 1 "Devourer" Fusion Monster from your Extra Deck using monsters from your hand or field as Fusion Materials. If you control no monsters, and your opponent controls a Special Summoned monster, you can also send monsters from your Deck as Fusion Material. You can only activate 1 "Devourer Polymerization" per turn.
Devourer Emergence
Quick-Play Spell
Declare 1 Extra Deck monster card type (Fusion, Synchro, Xyz or Link); this turn, each time your opponent Special Summons a monster(s) with the declared card type, you can Special Summon 1 "Devourer" monster from your Deck. You can only activate 1 "Devourer Emergence" per turn.
Devourer Contamination
Normal Trap
Special Summon any number of "Devourer" monsters from your hand with different names in Defense Position. If you control no monsters, you can activate this card from your hand. You can only activate 1 "Devourer Contamination" per turn.
Devourer Feast
Continuous Trap
When this card is activated, if you control no monsters: You can target up to 2 Level 4 "Devourer" monsters in your GY; Special Summon them. Each time a monster(s) on the field is destroyed, place 1 Feast Counter on this card for each of those monsters. If a "Devourer" monster you control battles an opponent's monster, at the start of the Damage Step: You can remove any number of Feast Counter from this card; your attacking monster gains 500 ATK and DEF for each Feast Counter removed.
