[LV1][LV2] Neither player's deck can be discarded, and this Spirit cannot be destroyed by opposing effect.
[LV1[LV2] When either player summons a Spirit / Brave through an effect, at least 1 cost must be paid in order to summon.
Rulings:
1. If your spirit is summoned by opposing effects (e.g. The Ninth's Clown Chinchilla), you're the one paying the cost.
2. Even if you summon a Spirit that states "unaffected in hand", you still need to pay 1 cost, as the effect targets the players, not the cards.
3. When this Spirit is on field, and you have an effect that can summon Spirits/Braves in no cost, you can choose not to activate the card-summoning effect.
4. You still need to pay 1 cost if you burst summon a Spirit/Brave.