Its also now the case that Mega Pokmon ex are worth 3 Prize Cards when defeated, when in the XY (and Sun & Moon ) series they were worth 2 Prize Cards
For true craziness, you can copy creatures that pump each other, trigger on combat damage, or have have abilities that trigger whenever something happenseach copy sees the others enter the battlefield and deal damage, so your triggers grow geometrically
While splashing removal spells can definitely be correct (either because its convenient or sorely needed), splashing game-winning cards tends to be right more often
The question then becomes: are any of those creatures worth five mana
If someone was opening packs and resealing bad packs that would be one for sure
These values were gathered during the presale window, meaning the prices are bound to go down upon release