If Transmute Artifact is countered, you do not have to sacrifice an artifact
Play low-cost Characters from your hand, accept combat hits to cycle Life cards into favorable positions, and use search effects to arrange your Life so the top card is a Supernova when you want to trigger
The Dark was slow to gain popularity with collectors and players as the set does not contain a lot of powerful cards in terms of game play, though Ball Lightning, Blood Moon, Maze of Ith and Sorrow's Pain are notable cards
Crafting this is easy though, and the recursive ability gives you an expensive loop for grinding through the lategame
Man-o'-War (Mirage/Visions/Weatherlight) Undo and Man-o'-War were often seen together in packs, and players debated which was better: the sorcery which took out two creatures, or the 2/2 creature which took out one
They're a really-not-new-at-this-point-but-maybe-new-to-you twist on double-faced cardsrather than transform, these cards let you play either of their two faces