With the help of cheap reanimation cards like Reanimate, Necromancy, and Animate Dead, Revenant Recon is capable of putting out a terrifyingly huge threat far earlier than other decks
It used to be the best, but also the most skill-intensive payoff creature Dredge had, but the card lost a lot of its power with the ban of Faithless Looting
2 mana is a lot for Goblin Electromancer, there are easier ways of winning than Grapeshot, and so on
Szarekh ensures that your graveyard is more than just a resting place, its a staging ground for your armys resurgence
Lotus Bloom has undoubtedly lost a bit of its luster since then, but its impact on MTG earns it a higher spot on this list
The same can be said for Do It Again