Kyodai, Soul of Kamigawa

The indestructible clause is a leash, not a gift. Most protection effects fire and forget: a spell pulses the board, resolves, and leaves. This one binds a single permanent's shield to the source, so the moment an opponent answers the flier, the permanent it was guarding drops its guard with it. That linkage runs the whole card. Flash and flying let it flicker onto an empty board at instant speed, tagging one key permanent with indestructibility while holding a counterspell-shaped bluff before ambushing on the crack-back, but the shield lasts only as long as the body does, and a 3/3 does little to guarantee that. The five-color activation answers that fragility: a rainbow stress test that asks whether your mana can reach every color to briefly turn the 3/3 into an 8/8. In a single-color shell it is decoration; in a five-color shell it is what lets the card close. As a color-pie statement it is a Dragon Spirit doing something white rarely gets at instant speed: durable, targeted protection that outlasts a single removal exchange rather than a one-turn combat trick. The catch keeping it fair is that the guarded permanent and its guardian share a fate. The card rewards you for defending it as much as for what it defends, and it hands the opponent a clean line: kill the Dragon, and everything it was holding up comes back down.