Mystic Barrier 

Enchantment
$2.05 #13582 0.53 12.8 years
When this enchantment enters and at the beginning of your upkeep, choose left or right.
Each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent.
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Cards similar to Mystic Barrier expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Pramikon, Sky Rampart98%
$3.02↑#6776↑0.637.0 years↓
"Each player may attack only the nearest opponent in the chosen direction and planeswalkers controlled by that opponent."
+1 more matching line
Teyo, Geometric Tactician89%
$9.24↑#5299↑0.36↓3.1 years↓
"−2: Choose left or right. Until your next turn, each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent."