Serum Visions does make you wait for the selected cards relative to Sleight of Hand and Opt
Monarchs were all about tribute summoning which would then allow them to use their powerful effects when they were summoned
While G-Max Wildfire is quite costly requiring 5 energy cards, while also discarding two from Charizard, its damage is a massive 300, which is capable of knocking out most defending pokemon in a single hit
Illusionist's Bracers will copy that ability, which you should also use to target the Worldgorger Dragon
Its been around since the first booster pack, and it really does what it says on the tin
However, in a dedicated Timelord deck, Empty Machine could see play as a valuable resource for maintaining field presence and recycling key monsters