Omnath, Locus of Wisdom

Whenever a player casts a spell, you may put a +1/+1 counter on Omnath, Locus of Wisdom.
Remove two +1/+1 counter from Omnath, Locus of Wisdom, choose one -
- you gain 3 life
- scry 2
- put two +1/+1 counter on target creature
- creatures deal no combat damage this turn
- add {1} to your mana pool