Cogwerx Prong Bot (Yellow)

When Cogwerx Prong Bot’s on-hit trigger against a hero resolves, it generates an optional effect: you may put a steam counter on an item you control with crank. In order to resolve this optional effect, you must control an item with crank in the arena or on the stack. If you do not, you cannot resolve this effect.

Cogwerx Prong Bot’s instant activated ability can only be activated while it is in your hand.