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.
