Five mana Time Walks are pretty fair in the cube
Contains 10+ cards, all randomised from 11 different sets
Depending how much mana youre able to generate, Inferno of the Star Mounts can also deal a lot of damage on its own
Of course, you'll want to replay Sephiroth to do it all again for a second, third, fourth, fifth, or sixth emblem and make every death hurt as much as possible
Hogaak, Arisen Necropolis and Uro, Titan of Nature's Wrath are prime examples of cards that enabled such powerful graveyard strategies it took the ban hammer to keep them buried
Theres a small amount of token creature generation and trigger copying present as well, but not enough to focus on as your game plan