It isnt just a pre-requisite to cast your commander, it's also how you can make up for the fact that the non-bomb cards in this deck are often mediocre ways to ping each opponent for 1 damage
Watermark: Orzhov Illustrated by Raoul Vitale Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
As Ari Lax put it: Its a Clue that turns into a big thing. Gallery and List of Incubate Cards Assimilate Essence Blighted Burgeoning Blight Titan Bloated Processor Brimaz, Blight of Oreskos Chrome Host Seedshark Compleated Huntmaster Converter Beast Corruption of Towashi Elesh Norn / The Argent Etchings Elvish Vatkeeper Essence of Orthodoxy Excise the Imperfect Eyes of Gitaxias Furnace Gremlin Gift of Compleation Glissa, Herald of Predation Glistening Dawn Ichor Drinker Infected Defector Injector Crocodile Marauding Dreadship Merciless Repurposing Norn's Inquisitor Phyrexian Awakening Progenitor Exarch Sculpted Perfection Searing Barb Sunder the Gateway Sunfall Tangled Skyline Tiller of Flesh Traumatic Revelation Best Incubate Cards The best incubate cards have proven themselves across multiple formats, from Cube to Standard
We set up at a table in the airport, he looked though the cards, counted the cash and we shook hands and made the deal
It involves copying your creatures and using energy counters to let them stick around (or, in some cases, letting them die to take advantage of death triggers)