Each of them resolves separately and compares the power of the evolve creature and the power of the new creature, and the same thing goes for toughness
It's the best of both worlds in a strong and reliable creature and a devastatingly strong planeswalker with the ability to completely shift the game.
They remind me of giant stuffed animals you get for winning carnival games at fairs, in the best way possible
The grim-dark world of Warhammer 40,000 doesn't lend itself well to pure representations of morality, order, peace, and structure
Try including them in your decks when you obtain them
There are plenty of other scenarios where either you dont have other creatures on the battlefield, they cant profitably attack, your Seafloor Oracle gets Lightning Struck before combat damage, and more where you wish your four mana creature in your aggro deck would have done more