Yamazaki, Sadist

Whenever a source you controls deals excess
damage, you gain that much life and add
{r}{r}. Then untap Yamazaki, Sadist and it gains
double strike until end of turn.
Serpent Slash —{t}, {x}{x}: Yamazaki, Sadist
deals X damage to target creature. If Yamazaki,
Sadist has double strike, it deals double that
damage to that creature instead.
"Here I go, here I go. Here I go!"