Sometimes you don’t need a Maximum.

RD/MAX2-JP049 天の啓示 Ten no Keiji (Heavenly Revelation)
Normal Spell Card
[Requirement] None
[Effect] Choose any number of monsters you control and send them to the Graveyard. If [The total original Levels of the monsters sent to the Graveyard by this effect] is 10 or more, you can also choose 1 monster (Level 8 or lower) in your Graveyard and Special Summon it face-up on your side of the field. The monster Special Summoned by this effect gains 300 ATK until the end of the turn.

Source