Your hand, graveyard, and library are still very much in the game (more on that later) and these cards will work as normal because you arent protected from effects such as these
Also, because he sends the face-up Spell/Trap as cost, you can use cards like Loading
I can pretend to be popular now
For example, if Narod, the Beige Flower and Doran, the Siege Tower ("Each creature assigns combat damage equal to its toughness rather than its power") are both on the battlefield, each time a creature would deal combat damage, that creature's controller chooses whether it assigns combat damage equal to its mana value or its toughness
Effects of this kind generally go in the formula of "but A, B, C, also D." 10: It's a recent change, but this is how card effects of this kind are now worded
The most common way of using this deck is by playing Sacred Phoenix of Nephthys monster cards