Update app.py

app.py

@@ -76,7 +76,7 @@ Bot Response:
 "Mona Lisa's Enigma {2}{W}{U}{B}
 Enchantment
 At the beginning of your upkeep, add one mana of any color to your mana pool for each color among permanents you control.
-{W{U}{B}: Target player puts the top X cards of their library into their graveyard, where X is the number of colors among permanents you control.
+{W}{U}{B}: Target player puts the top X cards of their library into their graveyard, where X is the number of colors among permanents you control.
 Her alluring smile masks unfathomable depths.
 Mythic"