If the effect of “DNA Surgery” is making all monsters on the field Dragon-Type, the ones that are Tributed will count for “Super Rejuvenation”.
You can activate “Super Rejuvenation” at any time outside the Damage Step, and the effect will be applied during the End Phase.
Multiple copies of “Super Rejuvenation” are cumulative. So if you activate two copies during your Main Phase 1 and Tribute two Dragon-Type monsters during the course of the turn, you will draw 4 cards in the End Phase.
If you have “Solemn Wishes” active on the field, you can increase your Life Points by the number of cards you draw for the effect of “Super Rejuvenation” x 500. So if you drew 2 cards by its effect, you can increase your Life Points by 1000.
Netrep Rulings:
Monsters changed to Dragon Type and Tributed are eligible for “Super Rejuvenation’s” effect.
Dragon-Type monsters Tributed on the opponent’s field are not counted for the purpose of “Super Rejuvenation.”
Dragon-Type monsters Tributed on your field by your opponent, through the effect of “Lava Golem” or similar are counted for “Super Rejuvenation.”
Netrep Q&As:
Q: Can you play a “Super Rejuvenation” that you drew in the End Phase through the effect of another “Super Rejuvenation”?
A: Yes you could. Curtis Schultz, 01/19/2004