Grx, Toxin Blade

First Strike, Wither
{x}{b} Exile Grx, Toxin Blade and place 1+X time counters on it. At the beginning of your upkeep
remove a time counter on Grx, Toxin Blade.
When there is no more time counters on
Grx, Toxin Blade, transform it and return it to
the battlefield with X +1/+1 counters.