Ill probably give this a whirl in my Zirda, the Dawnwaker deck, since it will discount that four-mana activation
Everything mentioned so far does count for a "when dies" trigger
On resolution they are all dying, no regeneration
One for the 1v1 tables, for sure, this is quietly parked in a lot of Pioneer sideboards
In the Pokmon TCG, Tera Pokmon don the same ornate jewel, strengthening their resolve and making them immune to attack damage while they're on the Bench

In fact, we've seen enough that you can make more than a top ten of them: Top 10 Commanders That Care About Casting Big Spells Imoti, Celebrant of BountyImoti, Celebrant of Bounty Jin-GitaxiasJin-Gitaxias Thryx, the Sudden StormThryx, the Sudden Storm Zhulodok, Void GorgerZhulodok, Void Gorger Brinelin, the Moon KrakenBrinelin, the Moon Kraken Henzie "Toolbox" TorreHenzie "Toolbox" Torre Runadi, Behemoth CallerRunadi, Behemoth Caller Gilanra, Caller of WirewoodGilanra, Caller of Wirewood Zaffai, Thunder ConductorZaffai, Thunder Conductor Troyan, Gutsy ExplorerTroyan, Gutsy Explorer Kalemne, Disciple of IroasKalemne, Disciple of Iroas Gandalf, Westward VoyagerGandalf, Westward Voyager Simon, Wild Magic SorcererSimon, Wild Magic Sorcerer Radagast, Wizard of WildsRadagast, Wizard of Wilds Glarb, Calamity's AugurGlarb, Calamity's Augur Helga, Skittish SeerHelga, Skittish Seer So, with that in mind, why not take another look at how you can make spells that cost a lot cost a little