Thats not all it does though, as Blossoming Tortoise also makes it so that activated abilities of any lands you control cost one less mana to use, and give any land creatures you control a +1/+1
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
Ironically, using this ability in combat may be the weakest application of it, since it doesnt let you cast powerful sorcery speed threats
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
(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