Nilnash, Bane of Casters

Hexproof
Whenever an opponent casts an instant or sorcery spell, Put a +1/+1 on this card. If you counter that spell, put two +1/+1 instead.
{3}{t}: Put a trap token artifact with,"{6}{t}: Sacrifice this token and counter target instant or sorcery. This ability cost {x} less where x is the amount of counters on Nilnash.", Onto the battlefield.