Like most Magic: The Gathering cards, the value of Mountain depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Battle for Zendikar)
We will be looking at the best of the bunch in an EDH environment, and seeing just how many Wilds of Eldraine Adventure cards make the cut
Flame Slash Flame Slash is a sorcery, but it makes up for the speed with raw powerdealing four damage to a creature for just one red mana
You benefit from opponents spending their creatures to fight Grothama and can use pump spells to control whether or not it dies and disperses cards to everyone
You arent putting Whirler Virtuoso in the deck as a primary energy sink, but if your opponent passes turn in a spot where dumping everything into thopters will give you on-board lethal, youre free to do that
In Commander, its very easy to abuse this card and while there is a Post Malone SL version as well as a white border from MYB2, this is already the chase version at $50