yugioh phantom thief deck Complete Custom for Yu-Gi-Oh! ARC-V The Phantom Thief Duo: Tactical

You can of course use other themes that work with Kellan, like foretell and plot

Blue-based artifact decks tend to do pretty well, alongside fast Combo decks like Painter's Servant decks or Cephalid Breakfast, named after Cephalid Illusionist

Criteria: Non-artifact (yes, I'm that sick of the botthe bot) Golgari creatures with the ability to draw cards or grab cards off the top of the deck or from your graveyard, either by allowing you to play them or by putting them in your hand, without an additional mana cost

This can save creatures or rebuy "enters" triggers, and it can also just bounce a land to trigger landfall