While you have a "Ruin Dragon" family Spirit in your Trash, this set Burst is unaffected by opposing effects.
[ Burst: After Your Opponent activates a Spirit's (When Summoned/Advents) effect]
Destroy any amount of opposing Spirits up to a total of 15000 BP. Effects of Spirits destroyed by this effect do not activate. After that effect resolves, summon this card without paying the cost.
[LV2][LV3] (When Attacks) Destroy an opposing Spirit with BP equal or inferior to this Spirit's.