The Great Fall

At the beginning of each upkeep, target player
chooses a creature.
At the beginning of the pre-combat main phase,
the chosen creature gains flying and hexproof.
At the beginning of combat, the chosen creature
gains +3/+3 until end of that combat.
At the beginning of the post-combat main phase,
the chosen creature loses all keyword abilities.
At the beginning of the end step, the chosen
creature is exiled (this effect cannot be negated or countered by any means).