Its slow but repeatable and harder to interact with
Another distinction of Skill Cards from other cards is that the card backing is different from the standard card backing, featuring some artwork of the character associated with the skill and text describing its activation conditions
We sacrifice Phyrexians to cards like Keskit, the Flesh Sculptor or mill them with Blight Titan, then reanimate them efficiently with cards like Victimize
Where do your products come from
Merfolk (little) and Sphinx (big)
When played, Yogg-Saron casts a random spell with random targets for every spell you previously played in the game, resulting in utter chaos from things like Yogg destroying your opponent's board, Pyroblasting you in the face, drawing a bunch of cards, betraying you and casting spells for your opponent, summoning a bunch of tokens, or even instantly killing himself