The activated ability is great in most decks, but I think it shines even better in a Dragon deck since the individual cards are very powerful, as are the tribal synergies
Its admittedly not the greatest rate as it only kills small creatures, but the debuff acts as a combat trick that discourages larger creatures from getting in, plus picking off that Orcish Bowmasters might be essential
To make it easier for you, Ive broken Dungeon cards down by colour so you can have an easier reference to what youre looking for and what colours are the best for Dungeon Crawling
It's important to keep cards that will help you add gas to your tank, so try to hold onto cards like Lucky, Pongo, Tinker Bell, Strike a Good Match, Hypnotize, and Improvize when you see them
With the vast array of multicolored Lands available, this requirement was not a challenge