Velira Watcher

Whenever a creature token leaves the
battlefield, put a +1/+1 counter on
Velira Watcher.
{1}{w/b}, Remove a +1/+1 counter from Velira
Watcher: Create two 1/1 white and black Spiri
t creature tokens with flying.

For every soul lost, the veil stirs and answers
with twice its might.