Enchant creature
When this Aura enters, look at target player's hand. You may choose a nonland card from it. That player discards that card.
When enchanted creature is dealt damage, destroy it.
A creature blocked by a creature enchanted with Cracked Skull still needs to assign damage equal to the enchanted creature's toughness (minus any damage already marked on the enchanted creature) before trampling over to a player, planeswalker, or battle.