Mystic-Wood Nephilim

Trample
Whenever a land enters the battlefield, put a +1/+1 counter on target creature.
Whenever an Opponent casts a spell, if
Mystic-Wood Nephilim has a number of +1/+1 counters on it equal to or more than the spell's converted mana cost, you may remove that many +1/+1 counters from Mystic-Wood Nephilim
and counter that spell.