Garruk, Wrath of the Wilds Spellbook Underdark Basilisk Wary Okapi Nessian Hornbeetle Pestilent Wolf Murasa Rootgrazer Sylvan Brushstrider Ferocious Pup Dawntreader Elk Trufflesnout Barkhide Troll Scurrid Colony Territorial Scythecat Garruk's Uprising Dire Wolf Prowler Mosscoat Goriak For a 4-mana planeswalker all of these spellbook options are pretty underwhelming
Heres a bottom-up example: I have this Sefris of the Hidden Ways precon deck
He responded promptly that he did and really wanted to get rid of them
Time will tell, but its certainly powerful, and something that you'll likely see at higher power tables
Cards like Exploration or Azusa, Lost but Seeking fuel multiple combats a turn
I also appreciate that the two commanders, Tidus, Yuna's Guardian and Yuna, Grand Summoner are both powerful and support the new summon sagas from the set without being so oppressively strong that all deckbuilding choices warp around them