Rampaging Baloths gives you a 6/6 beast with trample and landfall trigger - create a 4/4 Green beast creature token
Ultimately, synergy should be about editing a deck and finding ways to squeeze more flavor and more value out of every draw and every interaction, supporting the decks goals, themes, and game plan
But what if Olivia, Mobilized for War and Black cards in general are a trap, taking our focus away from the potentially better Mono-Red Madness deck
Milling 13 cards for four mana isn't a horrible rate (in terms of burn being five damage to the face for four mana, which isn't insane but not bad, especially with the weird, fringe upside of coming back form the graveyard)
Longtusk Stalker arguably solves one of the deck's biggest problems, offering a very powerful Turn 1 play that also supports the "snowball energy" theme of the deck