Best Moment, Stolas D-PR/504 PR

[CONT](RC):If you have a total of three or more rear-guards with the "Friend" ability or "Powerful" ability, this unit gets "Boost".
[AUTO]:When this unit is placed on (RC) during your main phase, choose a card from your soul, and put it into the drop. If you have a vanguard with the "Friend" ability or "Powerful" ability, choose a card from your drop with the "Friend" ability or "Powerful" ability, and you may call it to (RC). If you called a card, you cannot call cards from the drop until end of turn. (Putting a card from soul into drop is mandatory)