For example, if the creature card returned by Defossilize is somehow not a creature once it's on the battlefield, it can still explore
Furthermore, it also can negate the effect of an opponent's monster and take control of it once per turn by detaching a material from it
On top of that, the spells are actually playable
The Herald will keep you alive once you would lose the game, while also preventing your opponent from winning the game
Funnily enough, Samurott could use a partner like that Blastoise, as its attack scales with attached energy, but its primary purpose will be its ability to swap out both actives for free every turn
They also feature alternate and usually very beautiful artwork