Koll, the Forgemaster + Goblin Bombardment + Lightning Greaves + Impulsive Pilferer

Lightning Greaves equips for free, giving Impulsive Pilferer shroud and haste so it survives priority and can immediately be sacrificed to Goblin Bombardment; the death trigger makes a Treasure that replays it, and Koll, the Forgemaster returns the Pilferer to hand to close the loop. The engine runs at one red per cycle — the Treasure provides exactly that — making each iteration self-funding. Red-white aristocrats shells running Koll as commander assemble this fastest, since any tutor that finds Equipment or a sacrifice outlet puts two pieces in hand at once.