Yes, battle cards are like any other card type and go in your deck
Day of Judgment (Japanese Showcase, Fracture Foil) - $140 9
Equip Legendary Artifact - Equipment Counters (CTRL to add secondary) Drain Marionette Apprentice Fabricate 1 (When this creature enters, put a +1/+1 counter on it or create a 1/1 colorless Servo artifact creature token.) Whenever another creature or artifact you control is put into a graveyard from the battlefield, each opponent loses 1 life
They're not Chandra's goggles
Clones and creature theft abilities like Willbreaker and Agent of Treachery can help to support Rubinias creature theft theme, while Ivy, Gleeful Spellthief can be both another faerie and another way to take advantage of your opponents cards
Cantrips like Opt and Consider are essential: they give me cheap card selection and the ability to dig for answers, and when paired with value engines like Talrand, Sky Summoner and Murmuring Mystic, they can add up to a massive board before long