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
However, you can even get away with not paying any life points at all, if all you want is to prevent your opponents strong monsters from attacking for one turn
Sapphire Emerald Also Has Late Game Threats to Challenge Your Opponent The longer you can keep up the Mother Gothel/Aurora DM situation the better, enabling your characters to safely quest or take strategic challenges against your opponents characters
detaches two to Special Summon a ZS from your deck while also being able to banish itself to prevent one of your Utopia Monsters from getting destroyed
The second effect has many fear recovery replacement effects, and when used in preparation for a curse, it is a 1:1 exchange with a blessing, so it is not cost-effective, so it is rarely used
It is generally better than Infest and better than Dismember just in terms of effect (very little is more effective than Dismember at 1 mana!)