Tally Counter

When you cast this artifact, choose a creature type. Whenever you cast a creature with the chosen type, add a tally counter on this artifact
{t}, {g}, Remove all tally counters: All creatures of the chosen type you control gain power and toughness equal to the number of counters removed, and change the chosen creature type
Combine {g}{g}{g/w} Radar, Lifeform Analyzer becomes R.E.K. 3000