diff --git a/clash_royale/envs/game_engine/player.py b/clash_royale/envs/game_engine/player.py
index 4e93872..9025c43 100644
--- a/clash_royale/envs/game_engine/player.py
+++ b/clash_royale/envs/game_engine/player.py
@@ -88,6 +88,7 @@ def play_card(self, card_index: int) -> None:
 
         assert card_index >= 0 and card_index < 4
         elixir_cost: float = self.hand[card_index].elixir_cost
-        assert(elixir_cost <= self.elixir)
+
+        assert elixir_cost <= self.elixir
         self.pop(card_index)
         self.elixir -= elixir_cost