Uhluroo, Apex of Depths

Mutate {10}{b}{u/r}{u/r}
Uhluroo, Apex of Depths, costs {1} less to cast
for each permanent that left the battlefield
this turn.
Whenever Uhluroo, Apex of Depths, mutates
each player discards their hand then draws
seven cards. Each of your opponents loses one
life for each card they discarded this way.