If those cards also happen to contain creatures with notably powerful abilities, such as this Mardu Vampire Knight with the supremely rare eminence keyword, that price only goes up
If control or midrange decks can't deal with your indestructible creatures, that's a great way to close out the game, even after your opponent has stabilized
Its also not likely for anyone other than a dedicated token deck to have creatures left after this resolves
Now, the shenanigans: Combine with a creature like Neheb, the Eternal or Savage Ventmaw, then chain together extra combats by filtering the mana they produce through Aggravated Assault activations
A player is poisoned if that player has one or more poison counters
Clean gently with a soft cloth if needed