Guard Stan:
Oh, you picked a Blood Basilisk. Now, how should we trade? You can trade 1 Blood Basilisk for 5 Blood Werewolves and 5 Blood Dre Vanuls. Or, you can play the game that is popular among collectors and obtain it at a better bargain.
Trade it at the standard rate.
Play the game [Get it correct on the second try - 3 Blood Werewolves]
Play the game [Get it correct on the third try - 7 Blood Werewolves]
Play the game [Get it correct on the fourth try - 9 Blood Werewolves]
Listen to the game instructions.