It's no surprise that taking an iconic character such as Minnie Mouse and debuting a new Iconic rarity would immediately bring value, but Minnie Mouse - Sweetheart Princess also brings a warmth and nostalgic appeal with its golden, almost sepia-toned, look
When a Player turns things around, they can immediately attack on the same turn, which makes things more exciting than to wait a turn
You might then realise that destroying or exiling a creature might not be as effective as attaching an aura to it that either supes it up and sends it in the direction of your opponents, with the aid of Eriettes ability to stop creatures attacking you when enchanted by your auras or by using a card like Darksteel Mutation that turns it into a 0/1 indestructible bug with no abilities
That alone is pretty powerful, but I would say it is even more relevant for the fighting types than others, as they typically require a ton of energy in order to execute their attacks
One of my favorite cards in Myr tribal decks is Myr Incubator
Specifically, we measured uplink and downlink gain and output power on all five cellular bands