Thinking of an idea and trying to translate it to Magic is rarely going to feel more organic than something that starts with Magic and its gameplay already in mind
This sort of thing isn't terribly new, either
Now, if this card was an Aura, it would probably just move when the enchanted creature dies, but as it's an Equipment, it became a little trickier
These missions are the same type of missions you will see in your Daily Missions, but instead of giving out hourglasses (as they give out only hourglasses in the daily missions), many of these missions have the prize of Shop Tickets
While Ruby/Amethyst probably has the advantage realistically in that matchup, its not by a lot and a strong Sapphire/Steel player can certainly overcome Ruby/Amethysts tools either by gaining more cards in hand through superior draw support, or discarding that decks key cards via A Whole New World