Underworld Breach [Theros Beyond Death] Mountain Forest we were able to convert

we were able to convert sky-dock assisters into a defense system for the Aether Spire

You may play an additional land on each of your turns

Set: Guilds of Ravnica Promos Type: Instant Rare Cost: {B}{G} Destroy target permanent an opponent controls

"When he reached the entrance of the cavern

Set: Limited Edition Alpha Type: Enchantment Rare Cost: {R}{R} At the beginning of each player's upkeep

Underworld Breach [Theros Beyond Death] Mountain Forest we were able to convertSet: Theros Beyond Death Type: Enchantment Rare Cost: {1}{R} Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.) At the beginning of the end step, sacrifice Underworld Breach.