You cast them for cheap, they enter the battlefield, trigger their effects, and sacrifice themselves
Even if this creature dies, you can still get a good amount of value if it had counters on it
The 12-mana Emrakul is 12/12 and you steal all dorks a foe controls - note there is no give them back here
As a result, 108 cards on the card sheet are mythic rare or rare, with the remaining 13 slots containing filler cards

Krenko Goblins Krenko, Mob Boss | Illustration by Karl Kopinski Commander (1) Creature (50) Battle Squadron Beetleback Chief Bloodcrazed Goblin Bloodstone Goblin Boggart Brute Boggart Forager Clamor Shaman Foundry Street Denizen Frenzied Goblin Goblin Arsonist Goblin Assassin Goblin Assault Team Goblin Banneret Goblin Bird-Grabber Goblin Champion Goblin Chieftain Goblin Cohort Goblin Cratermaker Goblin Instigator Goblin King Goblin Lookout Goblin Matron Goblin Motivator Goblin Ringleader Goblin Shortcutter Goblin Smuggler Goblin Taskmaster Goblin Trailblazer Goblin Trashmaster Goblin Warchief Goblin Wardriver Hobgoblin Bandit Lord Keldon Overseer Krenko, Tin Street Kingpin Magmaw Mogg Flunkies Mudbutton Clanger Ogre Battledriver Pashalik Mons Siege-Gang Commander Skinbrand Goblin Skirk Prospector Skirk Shaman Squee, the Immortal Subterranean Scout Teeterpeak Ambusher Tuktuk Rubblefort Volley Veteran Weaselback Redcap Zada's Commando Instant (3) Battle Hymn Bombard Brightstone Ritual Sorcery (8) Burn at the Stake Direct Current Dragon Fodder Empty the Warrens Goblin Grenade Goblin Rally Goblin War Party Krenko's Command Enchantment (4) Boggart Shenanigans Quest for the Goblin Lord Warstorm Surge Goblin Bombardment Land (34) Mountain x34 Krenko, Mob Boss is the kind of commander thats easy to understand

1 2 "Origins Award Winners (1998)"