You can Special Summon this card (from your hand) by banishing 1 Spell Card from your Graveyard. This card can attack your opponent directly. You take no battle damage from attacks involving this card.
This card will fix the damage from every monster to 1000 damage. In the case for Spell Striker, it will enhance its damage to 1000 instead.
Impenetrable Attack is a very good card to protect your Spell Striker from being destroyed, and you do not take any damage due to Spell Striker’s effect. Other than that, you can use the listed cards to disrupt your opponent’s monsters and protect Spell Striker from being destroyed.