The nice thing about this distinction is that it lets you play both in a deck, giving the rare chance to run two of the functionally same card in a commander deck
Are they the most efficient versions of those spells (furthest down the curve), showing you the most cards (options) for the least mana
The price you pay for the resulting effects would be very expensive if attached to an instant or sorcery spell, but seeing that they are attached to a creature and can be activated repeatedly and at instant speed, the additional price seems a bit fairer
Only certain cards from certain sets can be found as etched foils
I almost started crying in front of my desk, haha
If you type in the word Pikachu, it will assist you with the auto-generated search, and you can pick the correct version of a Pikachu card