To make up for it, Wizards has made sure to slip a handful of fantastic green Commander cards into Brother's War set and booster packs

Abdel Adrian, Gorion's Ward Aboleth Spawn Abuelo, Ancestral Echo Adrix and Nev, Twincasters Aegis Sculptor Alley Assailant Alpharael, Stonechosen Amalia Benavides Aguirre Ambling Stormshell Ancient Adamantoise Ancient Imperiosaur Archive Dragon Archmage of Echoes Armguard Familiar Armored Armadillo Arna Kennerd, Skycaptain Arno Dorian Auntie Ool, Cursewretch Aurelia's Vindicator Aveline de Grandpr Axebane Ferox Basilica Stalker Bayek of Siwa Become Anonymous Benevolent River Spirit Besotted Knight Besotted Knight Better Offer Black Ward Bloomwielder Dryads Blue Marvel, Adam Brashear Blue Ward Bolrac-Clan Basher Boltbender Branch of Vitu-Ghazi Bristlebane Battler Bronze Guardian Brotherhood Regalia Bubble Smuggler Built Bear (playtest) Burly Breaker Cackling Prowler Cactusfolk Sureshot Calim, Djinn Emperor Campus Composer Canopy Gargantuan Captain America, Wings of Freedom Captain Howler, Sea Scourge Catch of the Day (playtest) Cathedral Acolyte Caught Red-Handed Chains of Custody Chapel Shieldgeist Chaplain of Alms Charmed Clothier Chicken Troupe Chizak, Apex Arachnosaur Codsworth, Handy Helper Colorstorm Stallion Colossal Skyturtle Combat Research Concealed Weapon Coppercoat Vanguard Cosmic Cube Crowd-Control Warden Cryptic Coat Crystal Carapace Cultist of the Absolute Culvert Ambusher Dancing Sword Defenestrated Phantom Dire-Strain Demolisher

It's a cleverly done homage to the patchwork creation of Victor Frankenstein, if a bit simplistic
In casual games yes, but not in serious play
You could count Oloro, Ageless Ascetic since its ability is really similar to eminence minus the tribal aspect
This Mesa does come with a bonus: it can tap two lands, and in so doing, disrupt your opponent's strategy for a turn