pokemon booster box gx Sun & Moon High Class Pack Ultra Shiny plus 9 of the OG Pokes including Mew ex and Alakazam ex Opening 3 Pokemon GX Ultra

Another possibility would be more Collectors Edition cards (with gold borders)

One person, in particular, recently lucked out with a pull featuring an Iron Crown ex holofoil

A 4/4 creature for 5 is a reasonable rate as well, though as with most of blacks best mana doublers, being a creature is a pretty significant drawback with the amount of spot removal and board wipes flying around

Its important to remember that as an aggro deck hitting on curve is important as well as triggering your abilities, so be ready to sometimes pass on going for an adventure to just your creature in there and apply pressure

They were given out as a prize in competitions in 1998, and only 39 of them were ever made - and around 10 are thought to still exist