This is one of those underrated life counting tools that is both a great talking point at the local game store, and a simple way to track poison counters, energy and commander damage
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
2021-06-18 When the cascade ability resolves, you must exile cards
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
Crafting this is easy though, and the recursive ability gives you an expensive loop for grinding through the lategame
Cards on the Reserved List (never to be reprinted) or emerging must-haves from new sets can also fetch a good price