Side deck? Do you mean with existing levels 4-6 cards?
Micro sounds like... Select which cards you want to 'Move' prior to your turn, and then they get a 'Dodging' bonus?
This sounds like: Start Skill: Unit behind this unit receives DF +25 for this turn.
Or: Auto Skill: Unit in front of this unit receive RNG +1 for this turn.
Meh - you've inspired more skills spam