2021-03-19 Effects that modify or replace the cost to cast a spell (such as flashback or casting a spell without paying its mana cost due to suspend) don't affect the spell's mana value, so they won't change whether Lavinia's first ability restricts that spell from being cast
According the Wizards of the Coasts Fan Content Policy you are allowed to use their IP under the following conditions
With Modern Horizons 3 , we made an exception to include 5 ally fetch lands in extended art to go along with the extended-art enemy fetch lands found in Modern Horizons 2
It going on top of your library is not super good, since you have to replace your draw to get it back, and theres a reasonable chance what you were going to draw was going to be better, but when it returns to your hand it will feel pretty good, and obviously thats true when it goes to the battlefield as well
The inclusion of alternate win conditions means you can build towards a win that your opponents won't see coming
This can be a great way to slow the game down and bring it to your pace
