You can activate this set Burst while ignoring the burst condition when your Spirits containing the name "Build"/"Cross-Z" attack, .
☼[ Burst: After Your Life is Decreased ] Destroy 3 opposing Spirits with cost 6 or lower. After this effect resolves, you can summon this Spirit card without paying the cost.
[LV2][LV3] (During your Attack Step) Your opponent must send 2 cores from their reserve to their trash in order to use Magic cards.