Vidar, God of Silence

This spell cost {1} less to cast for each creature your opponents control with a counter on them.
Vidar, God of Silence enters the battlefield with X +1/+1 counters, where X is the number of creatures your opponents control with counters on them.
Wither, First Strike
Remove a +1/+1 counter from Vidar, God of Silence, put a -1/-1 counter on target creature, then draw a card.