The colors also get brighter as rarity increases, with bronze, silver, then gold almost like medals
Additionally, you can pay 1 White mana to unattach an Equipment from a creature you control
Or imagine if you play this enchantment on turn 4, get a 2/2 for your fourth land drop, then pay your remaining 2 mana to sacrifice a Lander token
We have a variety of ways to keep triggering Kardur: the most common is by making token copies of Kardur with cards like Jaxis, the Troublemaker and Orthion, Hero of Lavabrink which trigger his mega goad before dying, but we also have bounce with Skull Collector and reanimate/blink with Rescue from the Underworld
Stern Lesson, as a Catalog variant, isnt particularly good in Blue/White, but triggering your draw two abilities in Blue/Black, and ramping in Blue/Green make the card better for those decks