J'Kar, Fog-cloaked Shaman

{b/g}, Sacrifice a creature: Target creature gets -2/-2
until end of turn if {b} was spent to activate this ability. If {g} was spent, prevent all combat
damage that would be dealt this turn. Activate
this ability only during your turn.
Whenever a nontoken creature you control dies,
you get two 1/1 black and green Insect creature
tokens.