Comet is a legendary major card out of the New mechanic pool. Starfall drops one comet at 400% damage in a 5 u crater with 3.5 u knockback.

You can take it once · it only turns up when your Ultimate ability can actually use it · it can be offered for 0 of the 34 abilities.

Only one card can reshape that ability this way — this one, or Meteor Shower and Burning Sky. Take one and the rest are gone for the run.