Well, I must say I totally agree with that. Electromagnets would really make magnets viable. And, yeah, what you say it's right. Summoning Valkyrion without Delta's effect is not so common
Yeah, MW is built around getting your magnets in the graveyard and using Delta to summon Valkyrion. Most MW decks only run one Beta anyway (since he's the weakest), so the odds of summoning Valkyrion without Delta's effect are slim to none.
This card would actually be a hindrance to a proper MW deck.
Quick question. Block Golem stops the monsters effects that activate on the field, so if you summon Delta from the GY using its effect, then you could crash and summon Valkyrion using its effect.