Forum:Stardust/assualt mode

Huge question....ok so lets say I have a stardust/assault mode dragon on the field and my opponent have 2 lightsworn lyla on the field. Ok after my opponent is done with his/her turn he/she has to discard cards on top of their decks to the graveyard due to lyla effects. Now my big question is Stardust/assault mode negates 1 lyla from discarding cards from the deck, but remember stardust/assault mode comes DURING THE END "PHASE" SEE HOW I PUT PARENTHESIS ON PHASE. So can stardust/assault mode return and also negate the second lyla from discarding cards? My thing is for you guys to remember that Stardust/assault mode effect is similar to tree born frog. Regardless to how many time u destroyed tree born during STAND BY PHASE he still return. SO CAN STARDUST/ASSAULT MODE NEGATE BOTH OF THOSE LYLAS EFFECTS DURING THE END PHASE?