Theres a lot of established heuristics on this subject, and a few points I can toss in to help you construct an optimal mana base for Standard, Modern, Pioneer, or whatever MTG format you prefer
Amy Pond was first released in the set Universes Beyond: Doctor Who, illustrated by Greg Staples
The stickers were really hard to use, constantly falling off cards and getting lost on the floor, and they were pretty much one-use only
While using an X-ray machine to peek inside a sealed package seems conceptually straightforward, there are in fact all kinds of challenges in actually pulling it off
Which flairs are available is dependent on the card : some Fire-type Pokemon will get Flames: Orange flair, while some Water-Type Pokemon will get Ripples: Light Blue flair
There are plenty that see play in a variety of formats, but we believe these ones pack the biggest punch