When Rydia enters the field, look at the top 5 cards of your deck. Reveal 1 Summon other than Light and Dark among them and cast it without paying the cost. Then, shuffle the other cards and return them to the bottom of your deck.
[X][Dull]: Look at the top X cards of your deck. Reveal 1 Summon of cost X or less among them and cast it without paying the cost. Then, shuffle the other cards and return them to the bottom of your deck.