Neither option is better than the other
While it only does 40 damage, you have a fifty percent chance of dealing 80 damage instead
Karn, the Great Creator might be controversial if your group leans heavily on artifact mana sources, but I actually have it here for the other two abilities: making artifacts into creatures lets Satya copy them, and the normally-dead wish activation can actually be used to loop Gontis Aether Heart, assuming you can proliferate enough loyalty and energy counters to keep that going
It can be the importance of your commander and the need to have a balanced mix of cards
Psychic and Lightning Energies, the most common, still feature in only one theme deck, but so does Fire Energy, one of the two rarest
Standard TCG Card Size Comparison Pokmon cards closely match the dimensions used by many competing card games