While is a steep cost to pay for this, this card is still a potent piece in Commander, especially if you can cast it for with a Rooftop Storm on the battlefield
In practice, this meant games were essentially a race to Lin Sivvi, and whoever would play their copy first would lock their opponent out of playing their Lin Sivvi, which allowed the first player to tutor up a bunch of Rebels and win the game
Tip: after preparing the demo Starter Kit decks you received with your marketing materials (mentioned later in this article), use the empty box on this display to draw attention without risking theft
And although I dont have a good answer for your deck, hopefully this list illuminated some possibilities as you brew toward your next Commander game
Oh yeah, it also doesn't really care about our endless creature removal, instead using spells to win the game, which means it's a deck we really don't want to face