Pokmon probably won't be your pension fund, but in a world of mythical creatures with special powers, you never quite know when the magic might strike
4 foil cards featuring Venusaur ex, Blastoise ex, Bulbasaur and Squirtle
While price is always an important factor, I think a better question would be "What is a good storage solution within my budget
If that 5 power Shimmer Dragon has Fireshrieker attached to give it double-strike and a Blackblade Reforged attached to give it +1/+1 for each land you control, there's a good chance someone's going to be dealt lethal commander damage
They arent numbered or counted in the main set and only come as standard cards not foil
The combination of deathtouch and first strike basically makes this unblockable unless your opponent has four creatures with 3 power that theyre willing to put in front of and potentially lose to Glissa