[Burst: After your opponent's spirit or brave's (When Summoned) effect activates] Send 1 core from an opposing spirit to your opponent's reserve. After that, by paying the cost, you can activate this card's main effect. (Main) You can summon 1 cost 4-or-less spirit from your trash without paying the cost. However if that spirit has a (When Summoned) effect, it can't be activated.