Silria, Backalley Stitcher

Exploit (When this creature enters the battlefield,
you may sacrifice a creature.)
Whenever you sacrifice a creature, if it had any counters on it, you may redistribute those
counters among any number of target creatures.
{4}:Put a +1/+1 counter on each corrupted
creature you control, if {w} or {g} was spent to
activate this ability, put two of those counters
instead.