The best sets to buy for Modern staples include those with powerful lands and format-defining cards
When we say annihilate the board, that includes the player casting this spell, which is very flavorful for something that depicts a nuclear war
If for some reason you can't win the game (because your opponent has cast Angel's Grace this turn, for example), you won't lose for having tried to draw a card from a library with no cards in it
On top of that, because this ability takes effect after the turn is over, theres no way to resist it using Summons, action abilities, or special abilities
Avenger of the Fallen can die before its mobilize trigger resolves and count as one of the creatures in your graveyard
The classic untap all my stuff combo is Dramatic Reversal and Isochron Scepter, but Aphetto Alchemist + Illusionist's Bracers will also tap and untap an artifact infinitely