Best Moment, Stolas (D-PR/269EN) [Clash of the Heroes]

[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 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)