Just like baseball cards or any other collectible, the condition of Pokmon cards has a massive impact on their value to collectors
These days, you tend to see the keyword action phases out a lot more frequently, and it tends to be tied to activated or triggered abilities or instants and sorceries
An untapped two-color land that doesn't cause you to lose life isn't common in Magic
Ideally, you should have something that covers one-shot artifact hate (Relic of Progenitus, Tormods Crypt, etc.), the interaction thats hidden in the opponents hand (Endurance, countermagic, etc.), other problematic permanents (Dauthi Voidwalker, Sanctifier en -Vec), and sometimes enchantment with static abilities (Leyline of the Void or Rest in Peace)
Sacrificing a creature sounds intimidating until you realize just how good black is at generating token creatures as fodder
Basically, rather than casting our Molten Rains and Stone Rains as quickly as possible, we're looking to hold onto them to use on lands not impacted by our 12 moons to keep our land lock has hard as possible