Theyre essentially any activated ability that creates mana (like most lands or Llanowar Elves), as long as it isnt a loyalty ability (like on Chandra, Torch of Defiance) or doesnt have a target (like the first ability on Deathrite Shaman
(2021-02-05) The last ability triggers when you exile a card from your hand using foretell, not when you cast a foretold card from exile
Doubling Season has made its way into six different booster sets at this point, and yet is nearly as expensive as its strictly-worse, single-printing cousin: Anointed Procession
All in all, I don't think Revolt Treasure Ramp is as competitive as Temur Miracle Grow, so if you're only looking to win tournaments on a budget, last week's deck might be a better option
This ability is obviously going to be a godsend in any reanimator deck, but itll be useful in any black-aligned archetype