The Shadow Bat

Begin the game with this card revealed.
During your upkeep Surveil 2 or Scry 2.
Creature with power equal to or greater than
the number of cards in your hand, can't attack you
unless the controller has one creature.
Whenever a creature attacks, its controller
discards a card for each. If they can't they
lose 2 life for each.
You have hexproof but can't declare an attack.