clear plastic sleeves for cards BCW 100 Count Card Sleeve and Toploader Combo Pack Self adhesive GameStop Trading Card Sleeves (25-Count)

When this attacking card destroys an opponent's monster by battle: You can activate this effect

Retrieved August 25, 2020

Powerful Pokmon ex and Trainer Cards Unleash the strength of 15+ Pokmon ex and customize your deck with 20+ Trainer cards for a competitive edge

The short answer as to why they were not included in Revised, and have not and probably will not ever be printed again, is because Wizards of the Coast considers them broken or overwhelmingly powerful , in laymans terms

That is still the case in today's metagame, though it is no longer necessary to use it strictly to counter Dragons

This along with normal full arts already having rainbow variants really bloated up sets from now having a handful for all the pokemon to 1-2 dozen a set