Tzhai's Study {4}{W}
Enchantment - Study
Archive 4 (As this enters the battlefield, shuffle the top four cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, destroy all nonland permanents you don't control with the same mana value as the drawn card.
Whenever you draw a card from the archived library, destroy all nonland permanents you don't control with the same mana value as the drawn card.
Details
Legalities
- Tzhai's Study is legal in every format.