If you look closely, there's one Swamp on Xander's Lounge among 21 lands
Its fairly compared to Rishkar's Expertise, which is a solid effect, but its better than that even
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At the beginning of each player's turn, that player gains control of the plane card in the command zone and is known as the planar controller
Aside from this, there's also the new 'Vanish' attribute, a sort of Achilles' heel mechanic intended to balance out some of the more powerful characters (typically 'Illusion' types)
Walking Ballista appeared in Aether Revolt, and has since seen reprints in Double Masters, Jumpstart 2022, and various Secret Lair drops