It looks like land is a new theme:
Planeswalker - Sorin Mythic Rare
+2 Sorin Markov deals 2 damage to target creature or player and you gain 2 life.
-3 Target Opponent's life total becomes 10.
-7 You control target player's next turn.
Illus. Michael Comarck #111/249 4
Creature - Beast Mythic Rare
Landfall - Whenever a land enters the battlefield under your control, you may put a 4/4 green Beast creature token onto the battlefield.
Valakut, the Molten Pinnacle
Valakut, the Molten Pinnacle enters the battlefield tapped.
Whenever a Mountain enters the battlefield under your control, if you control five other Mountains, Valakut, the Molten Pinnacle deals 3 damage to target creature or player.
to your mana pool.
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