As we look at other sets and cards, I'll be more likely to cut Wizards some slack if a Mythic breaks the rules but is part of a cycle

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The fact that it has built-in protection in the form of basically Hexproof
Also, no duplicates are allowed on these lists
To deal with Annihilator effectively, a player must use a spell such as Disallow that counters activated or triggered abilities or stop the Eldrazi before it attacks
It represents a massive mana boost on turn 3, if you had a turn-1 dork its mana neutral, and they stack beautifully