Spells that when they Resolve Sac a Land for Any Lands There are four of these, one four-cost sorcery that broke Standard with Valakut, and then sacs any number for any lands out tapped
With the Evasive keyword and his Circle Far and Wide ability, he allows you to draw a card every time your opponent draws while he is exerted
Summon: Primal Garuda gives a little bit of spot removal along with 2 turns of flying for Steiner
MTG Alpha Booster Boxes are basically unavailable on the market nowadays, and will likely go for north of a million dollars
Combine this with some card draw and search options, and you've got the beginnings of something beautiful - but only the beginnings
And that's the goal of Dimir Thieves: use cards like Siphon Insight, Gonti, Lord of Luxury, Thief of Sanity, Xanathar, Guild Kingpin, and more to steal our opponent's expensive cards and (hopefully) use them to beat our opponent