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#4. The Lich King
Expansion: Knights of the Frozen Throne
The Lich King, an iconic character in Warcraft and the trademark character of the expansion is one of the most balanced designed cards out there. It is the best legendary you can get in Arena right now (Onyxia is probably a little better).
The Death Knight cards which it generates can really help you turn the game around. Even the cards such as Doom Pact (destroy all minions and remove cards from your deck for each one destroyed), it can help you regain board control and win your way back up. It is also a powerfully statted taunt (much like Druid's Iron Bark Protector) which will take your opponents some effort to clear.
#3. Cobalt Scalebane
Expansion: Knights of the Frozen Throne
At first glance, Cobalt Scalebane is similar to Master Swordsmith (the guy who does the same, costs lesser and gives 1 damage). While it is not great stat wise, Cobalt Scalebane can buff even your smaller minions and make them a threat. Your opponent will have a tough time questioning whether to destroy your Cobalt Scalebane or the newly buffed high attack minion.
Coupled with the Dragon tag, Cobalt Scalebane has proven to be exceptionally powerful in Arena.
