Kindle, Ruby Slasher

{r}{r}{3}{t}Sacrifice a creature— Kindle, Ruby Slasher deals equal to the number of Mountains
on the battlefield to target opponent. If target opponent controls Islands, then deal X less
damage. Where X is equal to the number of Islands that player controls. If target opponent
controls more islands than there are mountains,
the owner of Kindle, Ruby Slasher takes the full damage instead.