Decks that have existed primarily because of Deafening Clarion, like Boros Angels and Jeskai, lack the tools with their current builds to compete with Golgari, leaving the format open for tokens
While cards made from blank cards wont be legal for tournament play, there are still plenty of uses for them and several online retailers you can buy them from
Number 336 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard
When taking an additional combat phase you go through all of the normal steps in a combat phase: Beginning, Declaring attackers, Declaring blockers, Combat damage, and End of combat
Pilgirm's Eye is the cure for mana screw, and Relic of Progenitus protects against graveyard shenanigans