Zoxer, Archfire Immolator

Observer (This permanent can't be countered,
can't lose this ability and can't leave the battlefield.)
When you cast Zoxer, Archfire Immolator,
choose one among flying, trample, haste, first
strike, deathtouch, hexproof and indestructible.
Creatures you control have the chosen ability.
Creatures your opponents control lose the chosen
ability.