Keilialeth, Shrouded Nihilist

Deathtouch
Whenever a creature you control dies, you may
pay {g}. If you do, another creature you control
gets +3/+3 until end of turn.
Whenever a creature controlled by an opponent
dies, you may pay {b}. If you do, another creature
that opponent controls gets -3/-3 until end of
turn.
"Eldritch blaiyst." - Keilialeth