Acidic Glavenus,Corroded Blade

Whenever Acidic Glavenus, Corroded Blade deals damage to a creature, that creature gets a -1,-1 counter. Creatures that receieve a -1,-1 counter this way cannot block creatures you control when Acidic Glavenus attacks.
When Acidic Glavenus, Corroded Blade dies, you create 1 Monster Material.