That dungeon type is Undercity
To be viable in Modern, a card typically needs to be cheap and efficient or offer unique utility, since the format is fast-paced and highly competitive
To save even more when building your collection, MTGs 30-pack Secrets of Strixhaven - Play Booster Box is on sale, too, for $135.50
Mega Lucario ex #179 ($278.07) Secret rare with alternate aura art, this Fighting ex synergizes with Trainers
If you actually play the physical game rather than just hoarding cards in your basement like a Pokmon-obsessed Gollum, this is easily the most valuable TCG product released this year
Having the option to activate it at instant speed can be great inside of combat or on other peoples' turns to try and dig for answers