The Sultai's ruthlessness leads them to use every resource at their disposal, even the dead
if/when you place lore counters on the saga again, you re-trigger the relevant chapters
But if you're holding cards, it makes you discard insteadso you're encouraged to play fast, stay low to the ground, and keep your momentum going
Having zero lands that enter the battlefield tapped means you have fifteen sources of green mana on turn one, which makes both Elvish Mystic and Experiment One much better than in other versions
When you spend this mana to cast an instant or sorcery spell with mana value 3 or less, you may exile that spell instead of putting it into its owner's graveyard as it resolves
The clearest example of this are the five-color legendary Slivers that weren't reprinted in the Sliver precon