Moldgraf Monstrosity provides eight trampling power that replaces itself on death, and few decks can get past a Hornet Queen's flying deathtouch tokens
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Ive personally tested it in Boros Energy, splashing black for Sephiroth and some Thoughtseizes, mainly because of how combo-heavy the current meta is
However, you are totally allowed to do the natural play and activate Selvala before going to cast Colossal Dreadmaw, checking to see if you can generate the necessary mana
Say via Delina, Wild Mage, who puts nonlegendary copies of the demon onto the battlefield already tapped and attacking
Ruins is generally better as it gets back Plating and Ravager but Stronghold gets back most of the things you want as well as some of the really spicy creatures like Welder and Disciple