Scroll of the Masters

Text:

Whenever you cast a noncreature spell, put a lore counter on Scroll of the Masters.
, : Target creature you control gets +1/+1 until end of turn for each lore counter on Scroll of the Masters.

Rulings:

• 11/24/2014 Count the number of lore counters on Scroll of the Masters as the activated ability resolves to determine how big a bonus the target creature gets. If Scroll of the Masters isn’t on the battlefield at that time, use the number of lore counters on it when it left the battlefield.
• 11/24/2014 Once the activated ability has resolved, changing the number of lore counters on Scroll of the Masters won’t affect the bonus that activation granted.