Level is a parameter that describes the Level of a card.

Acceptable forms:

Level:5   ---exactly Level 5

Level:>5   ---greater than Level 5

Level:>=5  --greater than or equal to Level 5

Level:<5    ---less than Level 5

Level:<=5  ---less than or equal to Level 5

Level!:5    ----NOT Level 5

Spell and Trap cards (except Trap Monsters, etc.) will always test False for any of the above forms.

Xyz Monsters have a Rank, so they will also always test false.