The First Eruption 

Enchantment — Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — This Saga deals 1 damage to each creature without flying.
II — Add {R}{R}.
III — Sacrifice a Mountain. If you do, this Saga deals 3 damage to each creature.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Clive, Ifrit's Dominant // Ifrit, Warden of Inferno 84%
$3.30#3554
"Add {R}{R}{R}{R}. If Ifrit has three or more lore counters on it, exile it, then return it to the battlefield ."
Geosurge 84%
$3.93#6719
"Add {R}{R}{R}{R}{R}{R}{R}. Spend this mana only to cast artifact or creature spells."
Downhill Charge 82%
$0.26#11976
"You may sacrifice a Mountain rather than pay this spell's mana cost."