If you have a small collection or are brand new to the hobby, I would suggest cardboard boxes
There are still some powerful annoyances like The Scarab God that can ruin any good game, but that just means we need to make sure we can answer it
You can leverage extra post-combat mana with Faeburrow Elder or Somberwald Sage, or double up activations of Mother of Runes or Captain Sisay
Why this is a good card to keep in your deck is that there are many characters, items, and actions that allow you to look at your top card, or cards, and return them to the deck
Call the Spirit Dragons Call the Spirit Dragons is a wonderful win condition that you're happy to play as is
Even as an avowed fan of variance in games, its hard to sell getting mana screwed or flooded as any sort of positive experience