Unfortunately, it seems like Wizards of the Coast dramatically underestimated how powerful the Companion ability would be, and the entire mechanic had to be nerfed after the cards featuring it were released
What makes Brigone good is that once it no longer becomes advantageous to attack, you can tap her to start removing those +1/+1 counters to draw cards
There are more powerful ramp lands, much more powerful ramp effects, more powerful late game value lands and again, much more powerful value effects on offer
Whenever a foe searches their library, you draw and gain a life too
Expensive creatures without abilities dont scale well in Constructed
The Slug in his rocket can be seen in the bottom right of the card as he zooms through and messes up the flavor text