Things like Witch's Cauldron, Bubbling Cauldron, Festering Newt, and the cat/Oven combo give you a bit of sacrifice synergy if you want some actual strategy in your deck
While these cards would maintain the blue, black, and green colors and provide a decent escalating threat, they don't quite fit Grand Larceny's theme when used as commanders
Liliana, the Last Hope is probably good, but I wanted to try a list with more proactive planeswalkers that actively generate card advantage, where Liliana, the Last Hopes Raise Dead is a little unreliable
This will easily go into decks with smaller creatures, or possibly lower power higher toughness decks were all about to experience playing or playing against
if you find too many games getting stalled out, try one or two of these to give white some evasion
Then when your foe's cast spells on other turns like yours you'll make a 3/3 Elephant token that becomes a 6/6 Ooze while this is out