Sephiroth, Fabled SOLDIER / Sephiroth, One-Winged Angel Blood Artist is the gold standard for sacrifice payoffs in Magic, so a legendary one makes perfect sense
In addition to forcing each player to skip their discard phase, Anvil of Bagardan grants each player an additional draw at the beginning of their draw phase, but then they must choose and discard a card from their hand, offering those playing with graveyard shenanigans the free discard outlet they would have gotten at the end of the turn but now just at the beginning, meaning they could take advantage of it during their respective turns
And if X is greater than (or equal to) the number of cards in your library, you win the game
By itself, Dredge can seem underwhelming, especially when it's on an unexciting creature such as Stinkweed Imp
The first is that the trigger on Aura Shards is a "may" effect
Even a player whos got no interest in the story will get a bit of a jolt from seeing Jace, once the poster boy of MTG and its foremost hero, becoming one with the Phyrexians and ending up covered in extra mechanical eyes
