Not really a fan of Cleave as a mechanic after reading it. Of the 10 cards that have it, 9 of them feel as if they would read cleaner if it was written as a kicker cost (even if the text takes up a bit more space). Lantern flare is the only one that feels like it actually needs it because workarounds for it would be all sorts of cludgy. That said

[R]Ash Blast 1R
Sorcery U
Cleave XR
[Discard a card]
Deal X damage to target creature. [X is the mana value of the discarded card]

It's silly and would probably make it an un card but I wanted the name to be cleaved as well and needing a card to be discarded would seem to make an Ash Blast rather rash. Option two was a [B]old warrior but adding abilities learnt with age while taking away a letter from the name seemed messier.