With 4 monsters assembled, they can be used interchangeably to either make 1 strong monster, or 3 level 4s on the field. Since the lower level magnet monsters are normal monsters, they are useful in a normal monster deck. With some good supports that can help it draw like White Elephant's Gift, or Heart of the Underdog, it can make it run much faster. The problem though, is the smaller monster zone in Duel Links. Valkyrion can only activate its ability when you have no other monsters on the field, making it much less flexible.
Obtainable via the card trader, this card has synnergy with the other magnet monsters to help summon Valkyrion. Since its ability is also activated when it's special summoned, it can be done in many ways. Cards like Symbols of Duty, or Regretful Rebirth can effectively be used to throw out your other magnet monsters. However, it also has a chance to throw out other Delta in your deck, which will not allow it to be used to summon Valkyrion, and the summoned Valkyrion will not be able to activate its ability since the magnet monsters are banished from the graveyard.
You can special summon Valkyrion the Magna Warrior (Must first be special summoned using the required condition) after successfully using its effect to fill the board with your Magnet warriors (Normal monsters).
Since magnet warriors are normal monsters this card can be use in some situations. Just be mindful that your warriors are needed in your side of the field or in your hand to summon Valkyrion the Magna Warrior.
I keep getting to platinum rank 2 and then I get stuck. I think maybe spiritual earth and last gamble might summon valkyron quicker. Any suggestions? Also don't play needle unless you have at least one valk in your hand