Disagree. Formula should be (Attack + Health)/2 = Number of mana crystals used + number of cards used.
In addition, 1 dmg = 1/1 stats = 1 card = 1 mana.
Murloc Tinyfin is only good because of the murloc tag, which adds on about .5/1 mana of value. The right comparison to make is to Wisp, which is perfectly fair (which means that it has never seen play, ever.)
just one of the Wisp decks that used to be in the game. FYI.
or Firebats more recent deck using Wisp
he apparently reached high legend in May with the Rogue Wisp deck!!