Tordek, Magical Mishap

Tordek attacks each combat if able.
If a source would deal damage to Tordek prevent
half that damage, rounded up.
When Tordek attacks flip a coin, then exile an
instant or sorcery spell in a graveyard at random.
Copy that spell and cast it without paying its
mana cost. If you lost the flip, choose all targets
of that spell at random.