Here's why:
* Tribute Summoning: This is a common summoning method in Yu-Gi-Oh! where you send monsters from your hand or field to the Graveyard to summon a monster with a higher level.
* Level Requirements: The number of Tribute Monsters needed to Summon a monster is determined by its Level. Generally, you need one less Tribute Monster than the monster's Level.
* Level 8: Since a Level 8 monster needs 7 levels worth of Tribute Monsters (8-1=7), and each Tribute Monster typically contributes 1 Level, you need a minimum of 2 Tribute Monsters.
Important Note: Some cards have special summoning conditions that may allow you to summon a Level 8 monster without needing the standard number of tributes. Always check the card's text for specific summoning requirements.