Lavinia prevents opponents from playing noncreature spells with converted mana costs greater than the number of lands that player controls, essentially shutting off high value mana manipulation entirely
The most notorious was Master of Five, a victory condition so nauseatingly easy to accomplish (after the event in question resolves all you had to do was generate one elemental effect of each of the five elements on the same turn to win at the start of your next one) that it was generally considered a mistake that should never be repeated (the gimmick victory conditions were not meant to be seriously competitively viable)
I keep them in my robe. Shiv I havent played with Planechase enough to know if this is a good card, but I like the art, and more space to get an artists signature is a good thing, right
Its what I like to call the Boros Advantage Engine
While its modest price might not inspire a lot of FOMO, you'll wish you had this card when it eventually creeps up in price
Five Bucks Goes a Long Way on MTG Online Most format staples on MTGO are far cheaper than their physical counterparts