Dredge plays differently than a deck like reanimator that cares about putting specific cards in the graveyard, Dredge needs to keep putting cards in their graveyard for the entire game to keep the engine rolling
This ability will also copy the next such spell or ability that you use this turn, which can be a very powerful effect with the right cards
Ranking: Fun Teval, the Balanced Scale I love when Wizards prints a pretty much strictly better version of a commander I love
Best for Raw Power: The Black Lotus and the Power Nine are historically the strongest due to zero-cost mana acceleration
I have done exactly that curve, Bombardment, Ophiomancer, Purph, and it is easily enough to win any game if they can't kill the Ophiomancer
Stairs to Infinity was the special promo card not included in any of the four Planechase (2012 Edition) decks that was given at release events