Thats the short version of why this enchantment sees so much play in EDH decks, above all those focusing on typal synergies
I once built a Standard deck and told Travis Woo that I loved it because every game was different. Ah, he said, thats the problem
You can then play those cards later, which turns your Vampire Commanders into a massive source of card advantage
The scariest thing you can do with this is blink it, but considering what else exists on the Gamechangers list, I dont think that play pattern is anything decks of that caliber cant handle
Keep Lavinia around and you can be the only one playing spells for cheap with Dream Halls, which could help you Enter the Infinite for the win while they cant Force of Will, which happens sometimes in EDH
Includes 20 custom booster cards inspired by the popular animated series