Your Classic Simic Mutant Dude

Reveal Your Classic Simic Mutant Dude when you draft it, and choose a number.
{g}{g}: Monstrosity 2. This ability costs an additional {x} to activate, where {x} is the number you chose.
When Your Classic Simic Mutant Dude becomes monstrous, you may put X +1/+1 counters on another target creature you control, where X is the number you chose.