Re: Random card drawn during attack, no damage dealt

You can see the shield on the top right hand corner around where your life is indicated, and on the shield there are 8 segments. You can also see 3 small shields below it. Each time a block happens,  it uses up one of those shields. After the 3 shields are gone, you'll notice that the heart with the life counter has no shield around it and that means that all damage is guaranteed to hit.