A deck that relies on drawing The Grass Looks Greener early to thin it down. You want to get as many Rock-type monsters into the graveyard as possible, especially the Normal Magnet Warriors, using them as fuel for the effects of your other cards. Use Restart to try and get The Grass Looks Greener in your starting hand.
That Grass Looks Greener is a very effective card for thinning down your deck. usually a deck with 30 cards would be very inconsistent because your draws become more unpredictable, but That Grass Looks Greener is an easy solution to that problem, milling down your deck to equal your opponent's deck. this could mean sending the top 10 cards of your deck when used at the start of the duel. Some card effects in this deck, like Tackle Crusader and Delta the Magnet Warrior, can trigger even when they are sent from deck to the graveyard.
Tackle Crusader's effect can be triggered when he is sent from the deck to the graveyard by the effect of That Grass Looks Greener. Letting you either change a monster's battle position or send your opponent's face-up spell/trap card back to his hand. Your opponent then cannot activate a spell/trap with the same name for the rest of the turn.
The Big Boss monster of the Magnet Warriors. Although special summoning him through his own effect is not efficient, summoning him though Delta the Magnet Warrior is very easy in this deck and gives you great field presense. plus if you have Alpha, Beta, and Gamma in your graveyard after activating Delta's effect, you can tribute Valkyrion to special summon all three from the graveyard.
Delta the Magnet Warrior is the best way to special summon Valkyrion. If you are lucky enough, when you use That Grass Looks Greener, you can send Delta and 3 other Magnet Warriors to the graveyard instantly summoning Valkyrion during your first turn. Delta is also good for milling your deck, letting you mill 1 Magnet Warrior from your deck every turn, you can use this to mill another Delta from your deck to activate it's effect to summon Valkyrion. Another way to use his effect is waiting for your opponent to destroy him, sending him from the field to the graveyard, while you have 3 or more Magnet Warriors other than Delta in your graveyard.
Beta the Electromagnet Warrior is mainly used to thin your deck by searching for another Magnet Warrior and special summoning it to the field, and by tributing him you also add fuel to your graveyard for other card effects. You can activate this effect during either player's turn making him great for dodging opponent's card effects.
Block Golem revives 2 low leveled Rock monsters from your graveyard, but they cannot activate their effects that turn. Special summon the Normal Magnet Warriors to use as tribute for Valkyrion. Revive Delta if you have 3 Magnet Warriors in your graveyard so that you can special summon Valkyrion when your opponent destroys him. Revive Beta the Electromagnetic Warrior and use his effect during your opponent's turn, further thinning your deck.
Triamid Pulse is a great utility card to have face-up on your field. The only cost to activate any of its effects are 2 Rock-type monsters from your graveyard, which you should have plenty of. You can use Triamid Pulse to destroy another face-up card on the field or revive a Rock-type monster in defense position. Note that you can only use Triamid Pulse once per turn.
Aside from Valkyrion, these two are your biggest boss monsters:
Gaia Plate the Earth Giant is very easy to summon while being very powerful wall, although as the duel progresses it might get harder to maintain him. To summon him you only have to remove from play 2 Rock-type monsters in your graveyard, and to maintain him on the field you must remove from play 1 Rock-type monster during each of your standby phases. But with 2800 attack and a 'built in Mirror Wall" it would be highly unlikely for your opponent to overpower it in battle.
Megarock Dragon is just a really big beater that is easy to summon. With all the Rock-type monsters in your graveyard it would be very easy for him to reach over 3000-5000 attack.
Not really? It utilizes a -1 self random mill. The only TCG decks I've seen using that is LS. Most graveyard setup in TCG is using tutor cards like Foolish Burial, Mathematician, etc or floaters like Card Trooper