So please dont kill your own creature with it
Firstly, she taps for mana, and when that mana is spent on a creature, it enters with two +1/+1 counters on it - representing her literally summoning a powerful monster to the battlefield
But what you should care most about is the absurd and funny possibilities that Krark, the Thumbless enables
In addition to this, a big part of the reason these cards were so popular was because the mana in that Standard format was quite bad, to the extent that you were pretty close to wanting Attune with Aether in your decks even before the energy bonus, but once you have the energy bonus you might as well play Harnessed Lightning, which means you may as well play Rogue Refiner to power up your kill spell, and so on
Here's what actually happens: you find a cool custom card back design online, place the order, and what arrives feels flimsy, prints muddy, or the dimensions are just slightly off