These commons form the foundation of the format
The effect goes like this: Red Dragon Archfiend "1 Tuner + 1 or more non-Tuner monsters After damage calculation, if this card attacks a Defense Position monster your opponent controls: Destroy all Defense Position monsters your opponent controls
Not only that, but he is the only one of the main Haymaker trio not to have any retreat cost
The best part is when you play defense with Marneus, its hard to attack into because you can make a 4/4 worth of blockers while drawing cards
Plus, there are Boros cards in Standard that care about small creatures attacking, or goblin benefits in red
"Altergeist Silquitous" on the other hand, can return another "Altergeist" card you control to the hand, and in return bounce back an opponent's card, allowing not only for removal but a unique form of protection for the Deck, while also provinding some recovery upon hitting the GY itself