Slobad, Actually Just Fine

Unknown Event (UNK) #RZ03a · Rare · Legendary Creature — Goblin Artificer

Mana cost: {1}{B}{R}

You can sacrifice creatures and artifacts interchangeably. (If an effect asks you to sacrifice one of them, you can sacrifice either.)
{1}, {T}, Sacrifice another artifact or creature: Put a rebuilding counter on Slobad.
{T}, Remove 3 Rebuilding Counters from Slobad: Create a token that's a copy of Bosh, Iron Golem.