Warmth gains you 2 life every time they cast a red spell, which is nearly every card in their deck, buying crucial time against a burn-and-swarm strategy built on Goblin Lackey, Piledriver, and Siege-Gang Commander. Caller of the Claw can flash in after combat to swing the race back with a wave of Bear tokens if combat trades put several of your nontoken creatures into your graveyard. Ravenous Baloth is a large, efficient blocker that stabilizes the ground against their small Goblins. Armageddon is much weaker here since blowing up lands does not answer a hand full of cheap threats already in play, and slow, low-impact cards like Auramancer, Squee, and Monk Realist do little against this clock so they make room for the incoming answers.