Melffys are adorable, but powerful Beasts, that generate immense amounts of advantage. "Melffy Puppy" Special Summons any Level 2 or lower Beast from your deck, "Melffy Catty" searches out any Level 2 or lower Beast from your deck, "Melffy Wally" Special Summons 2 other Melffys from your deck, and "Melffy Pinny" can Quick Effect Synchro using "Melffy" monsters from your hand or field. Their archetypal Spell cards are good too, allowing some destruction protection and recursion, as well as searching + resetting and ATK modification.
As "Nimble Beaver" is a Level 2 Beast, the "Nimble" Engine works very well in this deck, because "Nimble Angler" can be sent from the deck by "Spright Sprind", and Beaver can be searched out with the Melffys. "Alpha, the Master of Beasts" is an excellent wincon for the deck, as it has an excellent bounce effect, and can easily Special Summon itself, as almost all of our monsters have very low stats.
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