Whether this is because it's indestructible or because it will just come right back out of the graveyard, Deglamer can solve the problem by simply shuffling it back into the opponent's library and putting it out of their reach
Upgrading The Ruinous Powers If you want to upgrade the deck, there are a couple of approaches you can take
Just like how those clamouring for Hogaak, Arisen Necropolis or Faithless Looting to get banned in Modern a couple of months ago should have been registering the deck all along, if you want to win and genuinely believe a card needs banning in Pioneer, then you should be playing it and trying to break it
Trove Warden Trove Warden is another white card that allows white decks to rebuild post-board wipe or build up some value to offset the inevitable Wrath of God
Of these six designs, The Destined White Mage immediately catches our eyes
it should feel like a big creature deck that just happens to have the graveyard as its fastest route to get them out