710.1. Each leveler card has a striated text box and three power/toughness boxes. The text box of a leveler card contains two level symbols.
710.2. A level symbol is a keyword ability that represents a static ability. The level symbol includes either a range of numbers, indicated here as “N1-N2,” or a single number followed by a plus sign, indicated here as “N3+.” Any abilities printed within the same text box striation as a level symbol are part of its static ability. The same is true of the power/toughness box printed within that striation, indicated here as “[P/T].”
710.2a “{LEVEL N1-N2} [Abilities] [P/T]” means “As long as this creature has at least N1 level counters on it, but no more than N2 level counters on it, it has base power and toughness [P/T] and has [abilities].”
710.2b “{LEVEL N3+} [Abilities] [P/T]” means “As long as this creature has N3 or more level counters on it, it has base power and toughness [P/T] and has [abilities].”
710.3. The text box striations have no game significance other than clearly demarcating which abilities and which power/toughness box are associated with which level symbol. Leveler cards each contain only one text box.
710.4. Any ability a leveler card has that isn’t preceded by a level symbol is treated normally. In particular, each leveler permanent has its level up ability (see rule 702.87) at all times; it may be activated regardless of how many level counters are on that permanent.
710.5. If the number of level counters on a leveler creature is less than N1 (the first number printed in its {LEVEL N1-N2} symbol), it has the power and toughness denoted by its uppermost power/toughness box.
710.6. In every zone other than the battlefield, a leveler card has the power and toughness denoted by its uppermost power/toughness box.