The five creatures - Angel of Serenity, Angel of the Ruins, Blinding Angel, Restoration Angel and Sublime Angel - are attached to artwork of the moving statues first seen in the Dont Blink episode
As long as you have mana, you can create 5 thopters this way
Starting with just one Adrix and Nev equipped with a Helm of the Host will give you two more during the first combat step you have them out
Advanced Search Sets Random Syntax Showing 1-5 of 5 cards: "subtype: Background, colors: includes G" Display: Card Small Sorted By: Card Name Ascending Showing 1-5 of 5 cards: "subtype: Background, colors: includes G" Acolyte of Bahamut Cloakwood Hermit Hardy Outlander Master Chef Raised by Giants Advanced Search English
One card from above has the possibility of being a borderless planeswalker or showcase card
With enough creatures, even a middling roll turns into a massive team buff