Tamiyo's Safekeeping [Kamigawa: Neon Dynasty] Wizard Otter That player may cast that

That player may cast that card without paying its mana cost

" — Memorial inscription

Theme boosters are different than normal boosters:

“The Ring is mine

Tamiyo's Safekeeping [Kamigawa: Neon Dynasty] Wizard Otter That player may cast thatSet: Kamigawa: Neon Dynasty Type: Instant Rarity: Common Cost: {G} Target permanent you control gains hexproof and indestructible until end of turn. You gain 2 life. (A permanent with hexproof and indestructible can't be the target of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy it.) To keep the Reality Chip out of Jin Gitaxias's hands, the Wanderer entrusted it to Tamiyo.