The abilities that backup grants to the target creature are determined only once, at the time the ability triggers
Still, there are some good pieces to the Fairy type puzzle that might be more suitable elsewhere
The next Pokmon TCG release, Phantasmal Flames, has been revealed, and preorders are expected to open up any day now
Mentor means Whenever this creature attacks, put a +1/+1 counter on target attacking creature with power less than this creatures power. 702.134b: If a creature has multiple instances of mentor, each triggers separately
In a Constructed format like Commander, youll need to have at least ten of these 22 for your Attraction deck, and my guess is the more you have, the betteryoud hate to run out of Attractions during the game
If left unchecked, this deck will get out of hand and quickly