Breaking down the color requirements: chivalry, honor, and other traits that can be classed under the description 'noble' are typically represented by white, so white makes sense
It's only two mana for that effect without the ability to effectively ping it to death easily
+1/+1 counter decks might even run it in the main deck, although its a good sideboard card for other green decks
Sure enough, the recently previewed Ultimecia, Time Soroceress does give you an extra turn when she transforms into Ultimecia, Omnipotent
Pillar Analysis: Unique Effect (Mana Denial), Scarcity (Legends, Reserved List), Stax Archetype Staple
Each creature comes with an attack and defense rating in the bottom right corner, which signals how powerful the creature is, along with additional abilities listed on the card