This can stack all the way up to 8000 or higher, allowing it to potentially be the most powerful burn card in the game
While the chances of this happening feel low, this did technically happen with the Goblin Storm precon and Goblin Lackey
For example, if you used Souls of the Lost to craft Wretched Bonemass, its power and toughness while in exile are determined by the number of permanent cards in your graveyard, and Wretched Bonemass's power and toughness will change as the number of permanent cards in your graveyard changes
An odd card that is never really that bad in any deck at all and is often quite good yet still I find myself only playing it when I am able to particularly abuse it
(Blue-White-Red), brings back a mechanic many players havent seen since the Kaladesh set: energy
Autograph Book Autograph Book is another card that requires a little preparation (bring a pen!) and a room full of people, the more the merrier