Azure Beastbinder Greasefang, Okiba Boss Ink-Eyes, Servant of Oni Insatiable Frugivore Karumonix, the Rat King Lord Skitter, Sewer King Marrow-Gnawer Nashi, Moon's Legacy Nashi, Searcher in the Dark Nezumi Shortfang Pack Rat Rat Colony Rat King, Pale Piper Rat King, Verminister Splinter & Leo, Father & Son Splinter, Aging Champion Splinter, Radical Rat Tangled Colony Vren, the Relentless Wave of Rats Wick, the Whorled Mind
Activate only if Surge Engine doesn't have defender
The biggest difference is that ultra rare cards are in a league of their own, in the sense that they are a different type of card all together
In addition, more expensive cards may be those dedicated to specific events or issued at festivals, tournaments, and shows
This allows the deck to keep up with the other, faster decks prevalent in the meta right now