I can see an argument for having it be S-Tier (the ability to sacrifice a creature for free to draw a card is super powerful, potentially enough for it to show up in multiple decks) or even B-Tier (while various Sacrifice decks seem like the most obvious home, it's possible that the lists are so tight that it will be hard to find room for Yawgmoth, Thran Physician)
The Blight Curse and Dance of the Elements Commander decks, along with the rest of Lorwyn Eclipsed , are available for preorder now from your local game store, Amazon, TCGplayer, and elsewhere Magic is sold.
It's straightforward: open the six Draft Boosters from your Prerelease Pack (plus the promo card you get inside!) and build a deck with the contents
It's a relatively cheap price to pay for how much it accomplishes
It also has access to bounce spells like Into The Flood Maw, which can bounce an Agatha's Soul Cauldron after it exiles Vivi to permanently get rid of that Vivi copy
Peer Past the Veil Peer Past the Veil is kind of a wheel effect, especially if you overperform on your delirium