The card, while good in Pioneer, is not banworthy and only sees play in a few specific decks, like Izzet Phoenix
Goblin decks also have underwhelming card draw as a whole, so Vanquisher's Banner's second effect is vital
You can build Lavinia at pretty much any power level since its own power scales down with your opponents power
Better yet, some cubes, like Emma Partlows Peasant Cube, are pretty cheap if you just remove the top twenty or so most expensive cards and replace them with something else - a simple task, since theres no point to worrying about your cubes viability in the same way you would a deck
Whats the Salt Score
This isnt all that out there for anyone with a toddler, but it remains a little odd to see it leading the charge in a deck