Voldred, Swamp's Guardian

Flying, deathtouch (Alt art for Voldred, S.G)

At the beginning of each combat phase, if a
swamp entered the battlefield this turn. Target
opponent sacrifices a creature unless they pay 3
life.

"The first of the dragons transported to mirrodin
through the reforging of fates, was also the first to
suffer the effects of the glistening oil"