Akinori, the Blood Bender

Ninjutsu {2}{p/u}{p/r}
{u}{u}{u}{5}: Tap Akinori, Akirnori doesn't untap during your next untap phase. Take control of target player's next turn. Activate this ability only if Akinori dealt damage to that player this turn. This ability costs {1} less to activate for every mountain on the battlefield.
"Suiton: Super Edgy Jutsu: 4th Form!" - Some weeb, probably