The combination of Haste and Mentor with the powerful effect of preventing noncombat damage makes it very aggressive
She has three lore, she can exert characters at a whim to make them easier to challenge, and she prevents your opponent from exerting characters to sing songs which is literally one of the strongest (if not the strongest) mechanics in the game
There are three dungeons in this set, including Dungeon of the Mad Mage
In fact, I expect that weve only seen the tip of the companion iceberg, and we have barely begun to see the innovations that these new creatures will bring to Standard and other Magic formats
Cards like [c]Pithing Needle[/c], [c]Damping Matrix[/c], [c]Collector Ouphe[/c], [c]Stony Silence[/c] and [c]Karn, the Great Creator[/c] can all prevent your opponents activating equip by stopping them using their artifacts activated abilities entirely