Use their creatures against each other to chip away at their life totals enough that your direct damage effects and flying demons can sneak in and finish the job
Sure, there are dual lands, Power 9, The Tabernacle at Pendrell Vale, Juzm Djinn, et cetera
Youll notice that when Hanweir Garrison attacks, it creates two 1/1 Human tokens, showing how the Withering Township has fully consumed everyone who lived in Hanweir and condensed their united might into one massive creature
Then the revived plants and earth spirits exist in his GY
He is great in ramp decks where he gets Mana Vault, Voltaic Key, Mana Crypt and of course lands and he is great in combo decks where he gets Lions Eye Diamond, Pyrite Spellbomb, Chromatic Star and many of the previously mentioned cards too
Revavroom ex 15/64 Loading