Hearthstones economy operates similar to Arenas in the sense that its free, you can grind free rewards, and you can also buy packs
It may also end up being useful in Wheel decks, though I expect most people will be reluctant to assist you with Nekusar, the Mindrazer or Niv-Mizzet, the Firemind on the table
Levels: Some spells will have effects that change across three different levels depending on the amount of mana paid, indicated by the new keyword Levels. Flashback: The Flashback mechanic returns, this time appearing in a cycle of Towns. Land Cycling: Convenient abilities like land cycling, island cycling, and swamp cycling, which allow players to search their library for specific land types, will also be included
Needing to spend three mana to kill a one-drop is a huge loss of tempo
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