Effects that say the enchanted creature can't be regenerated won't prevent umbra armor's effect from being applied
(There is psychological value to countering an opposing spell with a Force Spike since they are so easy to play around, yet it's not worth playing around them in Commander because they aren't heavily played, which makes getting your powerful spell hit by Jwari Disruption especially devastating.) As for the rest of the bunch, Silundi Vision is listed as an often play just because you need to be a reasonably spell-heavy deck for it to work
Borborygmos Enraged Borborygmos Enraged turns spare lands into Lightning Bolts for a terrifying threat
Azorius Guildgate Baldur's Gate Basilisk Gate Black Dragon Gate Boros Guildgate Citadel Gate Cliffgate Dimir Guildgate Gateway Plaza Golgari Guildgate Gond Gate Gruul Guildgate Heap Gate Izzet Guildgate Manor Gate Orzhov Guildgate Rakdos Guildgate Sea Gate Selesnya Guildgate Simic Guildgate Talon Gates of Madara The Black Gate Thran Portal
2-cost Tech These three cards are known for how powerful they can be in already recognized archetypes
Eight mana is pushing it, but Sauron, Lord of the Rings delivers
