You can only activate 1 other "Mulcharmy" monster effect, the turn you activate this effect
If you want to be sure you get one, its a good idea to preorder ahead of time, since smaller shops sometimes only order limited quantities
Duels Decide Everything: Diva tries to avert this in his first encounter with Kaiba over the Millenium Puzzle, boasting that his power will let him send Kaiba off to another dimension
With Gardevoir ex [Scarlet and Violet], Mirage Gate, Baxcalibur, Flaaffy, Archeops [Silver Tempest] and a few others working with Mew ex, you can copy attacks with ease
As with most new Magic releases, I have resigned myself to the fact that rarer cards are harder to get, and these may elude me as I go on my personal collecting journey but I will be sitting on the sidelines, coveting these cards, regardless