The second card will draw when anything that ain't a token arrives to the party of a creature-based nature
Also, in the same pack, he can easily be used in Guardragon by using Synchro around level 6 and equipping Hari and Three Burst while using it as a material
However, this is a one-in-a-million find, so adjust your expectations and consider a sensible approach: be aware of the opportunity if it comes to you, but do not spend a bunch of time searching out estate sales
The deck has 14 2-drops which accelerate you to 4 mana on turn 3, plus the usual Sol Ring of course
After companions proved to be dominant in tournament situations across various formats, WotC decided to nerf the companion rule, and now you need to pay to put the companion from your sideboard into your hand before being able to cast it
While it can provide a powerful board-clearing effect, there are other cards like Harpie's Feather Duster or Twin Twisters that offer similar or better removal options