rare secret rare pokemon card card illustration featuring Ambipom (#107) from the Pokemon TCG. The Gold Secret Rare Cards

You can choose which side you want to play when you cast it, and this 'unlocks' that door

With a haste enabler, like Lightning Greaves, and a way to untap creatures or generate mana on death, like Pitiless Plunderer, you can create an infinite loop of Joo Dees, filling your graveyard with the Surveil trigger

Pitiless Plunderer isnt exactly a paragon of efficiency, but if you are specifically looking to sacrifice a lot of creatures and a lot of artifacts, it has a niche

The 1/1 bears also get another -1/-1 counter, bringing their toughness to zero, and dying as a state-based action (more on why this matters in a bit)