Convenient Panic Attack

This spell cannot be countered by spells or effects.
Until end of turn, spells that you cast and abilities that you activate are uncounterable. You and permanents you control become indestructible and gain hexproof until end of turn. You cannot lose the game this turn.
The card's author thought of giving the caster and his or her permants shroud instead, but he feared that having to think before using this card might trigger panic attacks in players.