Here's why:
* Advanced Ritual Art's effect: "You can Tribute monsters from your hand or field whose total Levels equal or exceed the Level of the Ritual Monster you Ritual Summon. If the total Levels exceed the Level of the Ritual Monster, you can send the difference in Levels as Level 1 monsters from your hand or field to the Graveyard."
This wording means:
1. Minimum Levels: The total Level of the Tributed monsters must equal or exceed the Level of the Ritual Monster you're summoning.
2. Excess Levels: If the Tributed monsters' Levels exceed the Ritual Monster's Level, you can send the difference as Level 1 monsters to the graveyard. You don't have to, but you can use this to make the Levels of the Tributed monsters exactly match the Ritual Monster.
Example:
Let's say you want to Ritual Summon "Black Luster Soldier - Envoy of the Beginning" (Level 8). You have:
* "Blue-Eyes White Dragon" (Level 8)
* "Baby Dragon" (Level 1)
* "Mystic Tomato" (Level 2)
You can Tribute "Blue-Eyes White Dragon" and "Mystic Tomato" (8 + 2 = 10). Since the total level (10) exceeds the Ritual Monster's level (8), you can send 2 Level 1 monsters (the difference) to the graveyard, like "Baby Dragon" or any other Level 1 monsters you have.
Key Takeaway:
Advanced Ritual Art gives you flexibility to use monsters with higher levels than the Ritual Monster you are summoning. You can choose to use this flexibility or not, depending on your situation and available monsters.