The Judgment Caller

Begin the game with this card revealed.
Whenever a spell is cast, its controller either
discards a card or loses 5 life otherwise
its countered.
Whenever a spell is cast, its controller sends
the top 3 cards of their library into
their graveyard.
All damage is halved, and player's can't declare
an attack unless they lost life previously.
If you are eliminated, all other life totals
become equal to the lowest overall.