Each upkeep, everybody puts onto the battlefield Zombie tokens with haste
Any change to a land's type or abilities gained by a land can affect the types of mana a land can produce
At first glance, its stats dont seem anything special, but if an opponent wants to challenge any of your characters while Tiana is exerted, they either get -3 strength, or pay three ink to remove that penalty
While ostensibly a combo piece when you consider cards like the aforementioned Dockside Extortionist or Mana Geyser, its also a great way to buy back the odd spell or two, or rebuild a board after a board wipe
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Still, a four-mana token generator isn't bad, and if left unchecked, Garruk can definitely become a game-ending problem for your enemies