A combination board of Matron with a Lackey in play both gets you any goblin you need and lets you play it for free (provided the Lackey doesn't have summoning sickness)
Purphoros, Bronze-Blooded just loves for you to get your attack triggers in and Anax, Hardened in the Forge is a bit of no-cost removal and board wipe insurance to keep attackers on your side
The powerful Creature also requires two mana to be specifically colorless, much like Kozilek, the Great Distortion
Whether its at sorcery speed or instant, a creature or a planeswalker, effects like these are the defensive glue which hold decks together, preventing losses and securing wins
Eventually we close out the game with extra combats like Aurelia, the Warleader, pumping our entire team as we make tokens with Goldnight Commander, giving our team up to +3/+3 with Skyhunter Strike Force, or pumping Otharri into something lethal with Mace of the Valiant