Simply stall the duel until you can "gift" him Jam Breeding Machine with the "Surprise Present" skill and perform the union attack combo when you have 0 cards left. Relies on a bit of luck to get the jam breeding machine in the early turns, otherwise it can be difficult. Alternatively, you can use cards like Bee List Soldier with Worm Bait, or others that can help with draws to make it more consistent.
Anti Spellcaster/Relinquished cards
Here is the list of cards that will counter Pegasus Lvl 50. For the basic cards to be used stall turn and to get high score, see How to beat/farm Pegasus Lvl 40 page.
Curse of royal doesn't work against Magic Drain. Can I use Seven Tools of Bandit or any other card instead? I switched to Seven Tools of Bandit already (not a very good choice as I have to pay 500 lp so cannot get No Damage assessment) but he has yet to appear for me to try
It works man. You may don't know how each of your card works against his cards. I lose my first 10 duels also, but I slowly learned from those lessons. Now I know how to use it and can win most of the time
Very complicated ruling here. Magic Drain states that the card negates a spell and, IF SUCCEEDED, destroys it. So there is a condition to destroy.
On the other hand, Curse of Royal negates a card that INCLUDES the effect of destroying another.
So, the only thing I can think of is that Temple must be negated by Drain to unlock its condition of destroying a card; and then Royal use is aplied.
I find same problem. Now I will try to use Seven Tools of Bandit instead. You may switch one of your trap (like Ready to Intercept) with any spell card so you can send it to the graveyard to nagate the Magic Drain.