Target up to 3 Level 4 or lower "Magnet Warrior" monsters in your Graveyard; add them to your hand. During either player's turn, except the turn this card was sent to the Graveyard: You can banish this card from your Graveyard, then target 1 of your banished Level 4 or lower "Magnet Warrior" monsters; Special Summon it.
It's slow, and getting back Magnet Warriors from the Graveyard isn't particularly useful unless you build around Valkyrion for some reason. It's more useful in the TCG, where less of your deck is Magnet Warriors and you have more control options, but here in DL, Magnet Warriors are likely going to be aggressive Berserkion decks, and thus want to banish the Magnets anyway.
Most of your "Magnet Warrior" monsters will end up being banished for Berserkion or Valkyrion (Delta), you will not have them in the GY for Magnet Conversion.
Unless you are actually playing Alpha, Beta and Gamma The Magnet Warrior with Valkyrion, you are not going to get much from this card.
This card is very useful actually. I have an aggressive berserk deck and when I banish the magnet warriors I use this cards secondary effect to get my only beta back into play and then I can summon a second berserk
What would be some good cards that return banished cards to the deck? I was thinking of using only 2 electro gamma and alpha and one of each of the regular magnet warriors and using in conjunction with the card that turns normal monsters into tuners as well but that's really a secondary thought. the main idea is to get banished cards returned.