Magnet Warrior Gamma: 1500 Attack, 1800 Defense
Now, for cards that are required for a combo, their stats aren't too bad, but this is for a reason: high stats make them difficult to search for. Alpha and Gamma can be searched for with Critter and Giant Rat, but Black Forest Witch does nothing for them.
One of the great things about this card is that you can discard the Warriors from play or from your hand, just like a Fusion. Additionally, just like a Fusion Monster, the Magnet Valkyrion can't be special summoned from the Graveyard unless it has been in play first.
Everyone and their mother knows about the infamous Devil Franken combo to kill your opponent in one turn, but there are very few who know that this can also be done with the Magnet Valkyrion. Discard the Magnet Warriors to play the Valkyrion, sacrifice the Valkyrion to special summon the Magnet Warriors, and use either Raise Dead or Early Burial to bring back the Valkyrion. You can now attack for 8100...just barely enough to kill your opponent.
Now, there are advantages and disadvantages to using this strategy over Devil Franken. To deal 9000 damage with Devil Franken's Combo, you need 2 cards in your hand, and one of them can be searched for. To deal 8100 damage with the Magnet Warriors, you need 4 cards in your hand, and one of them can be searched for. Additionally, it is a good idea to add a card that clears the field of Magics and Traps, and another that clears the field of Monsters. Add 2 more cards to each combo for this, and you get 4 vs 6.
However, the Magnet Valkyrion has a few distinct advantages. First of all, you don't have to sacrifice 5000 Life Points. If you try the combo and it fails, you're still doing okay. Additionally, you can still revive the Magnet Valkyrion later, whereas you cannot revive your dead Blue-Eyes Ultimate Dragon in a Devil Franken Deck. Also, the Magnet Valkyrion strategy is broken into 4 different damage-dealers, which means that your opponent has to deal with all 4 monsters if they want to survive for long.
The last advantage, though a small one, is that the Magnet Warriors are not dragons. There are tons of cards in this game that aim specifically to destroy dragons, and the Magnet Warriors won't be phased by these cards.
While Devil Franken is fast and reckless, the Magnet Warriors work at a relaxed pace. It's a combo that you'll probably have to wait for, but once it finally goes off, your opponent will have a lot to deal with.