Like most Magic: The Gathering cards, the value of Lord of Extinction depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Amonkhet Invocations)
The Remote Duel Forbidden List can be found in the Remote Duel Best Practices Guide at this link: Cards that have been altered from their original appearance with surface decoration may be used for play only if the alterations do not obscure any portion of the card text, make the illustration difficult to recognize, or make the card distinguishable from other cards in the Deck while it is face-down
ABC - Dragon Buster is arguably one of the best fusion monsters ever printed , and it works around the usual fusion summoning restriction by banishing the materials for its summon from the field or the GY
Elsewhere everything seems pretty fine
Being the monarch lets you draw a card at the end of your turn, but you can lose the status when another player deals combat damage to you
