The core of this build is Сквернорог combined with Шелковистый мотылек. Сквернорог's Battlecry gives your Beasts and Demons +1/+2 and deals 1 damage to them, twice. Every time Shimmermoth takes damage, all your Жукs gain +2/+1 permanently (golden: +4/+2). With golden Brann, a single Сквернорог Battlecry deals 6 damage to Shimmermoth — that is +12/+6 to every Жук per proc (golden Shimmermoth: +24/+12).
The engine is golden Рилак-металлист positioned between Сквернорог and Shimmermoth. Golden Rylak is critical — its Deathrattle triggers the Battlecry of both adjacent minions, firing Сквернорог's Battlecry again. Страшный ара's Rally triggers Rylak's Deathrattle on attack without Rylak dying. Golden Тит Ривендер triples all Deathrattle procs. With golden Macaw (Windfury + Reborn from Шустрый скарабей), golden Titus, golden Rylak with Reborn, and golden Brann — a single combat produces 30+ Сквернорог procs, scaling every Жук by +360/+180 or more per turn. This stacks permanently.
Жукs are summoned through Deathrattles — Shimmermoth, Жужжащий вредитель, Лесной бродяга, and Рунный прародитель all spawn Жукs on death. Titus multiplies these spawns. The spell Благословение жуков summons two additional Жукs in combat. Every Жук that enters the board inherits all accumulated buffs from the entire game.
Parallel scaling channels stack on top of Shimmermoth. Лесной бродяга's Battlecry gives Жукs +2/+1 (tripled by golden Brann) — cycle it through buy-sell in the 7th board slot. Бирюзовый быстролап's Deathrattle gives Жукs +5/+5, multiplied by Titus. Рунный прародитель's Avenge gives Жукs +3/+2 during combat. All of these stack with Shimmermoth's scaling simultaneously.
Очи Матери-Земли (Tier 6 spell) can golden Сквернорог, Rylak, or Macaw — all are Tier 4 or below. For extra speed, place a second Сквернорог next to Rylak so golden Rylak procs both, or add a second Shimmermoth — but this locks a board slot and selling a Tier 6 is costly.
Note: Шелковистый мотылек was nerfed in patch 35.0.3 — Жук scaling reduced from +2/+2 to +2/+1 per damage. The build still works but scales Health slower than before, making you more vulnerable in early combat rounds.
In the endgame, replace the scaling engine with Жук spawners — minions with Deathrattle: Summon Жукs — and keep Тит Ривендер. Your Жукs carry hundreds of permanent stats, and every spawner multiplied by Titus floods the board with massive tokens.