It can hit almost any permanent, and depending on what colors your opponent is playing, it can be very difficult for them to remove the Ring
Umbra armor won't do anything because it won't have to
At MagicCon Las Vegas, I had the opportunity to participate in a round-table interview with three of the designers behind Magic 's Final Fantasy set: Principal Narrative Game Designer Dillon Deveney, Senior Game Designer Daniel Holt, and Executive Producer Zakeel Gordon
Its not even an Enchant World (or World Enchantment, as I guess they are technically labeled these days), removing that possible axis of interaction
You can use 4-5 colors if you want, but it requires a very carefully curated manabase
Flameblade Angel: great effect that can ping your opponent to death, but its a 6 drop rare that doesn't kill you in a few terms and that means its a guaranteed junk rare in Modern, and only somewhat playable in Standard constructed