Hour of Devastation At 5 damage to each creature/planeswalker, Hour of Devastation is not the most reliable board wipe at 5 cmc, but it will still do what you need it to do in most situations
Naturally, a land in play is worth more than ephemeral treasures
While not as powerful as Selesnya Charm nor as widely useful as Dimir or Izzet Charms the Rackdos Charm manages to offer a lot of new and highly useful things to Rakdos and gives a lot more reach and potential to the colours as a result
It includes six new cards: Call Forth the Tempest, Nazgul Battle-Mace, Witch-king, Sky Scourge, Mordor on the March, Fell Beast of Mordor, and Minas Morgul, Dark Fortress
So, overall, I would say the abilities help one another out at least a bit
Alone, they don't provide wonderful protection against bends and chips in the side from shuffling, so definitely make sure that you double-sleeve these