Failed Experiment

If a source would deal damage to Failed Experiment, prevent half that damage, rounded up. Put X storage counters on Failed Experiment where X is the damage prevented this way.
{t}, Remove X storage counters: Add X mana of any color among permeants your opponents control.
{x},{ut}: Failed Experiment gets +X/+0 until end of turn. Damage dealt to or by Failed Experiment cannot be prevented this turn.