How about Blackmail
Now the Lich triggers and sees three lands, unless it is one of the two cards you need, and puts at least one land into the graveyard, triggering Gitrog again
Being able to create a 1/1 creature token that can be tapped for green mana can easily help you get more expensive resource-heavy plays off the ground and if you build a ton of these Elves, you can then take full advantage of the third ability to turn your commander into the ultimate draw engine
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Since we're generating so many tokens off our commander we're utilizing them different ways like ramping with Prosperous Partnership, drawing cards and dishing more damage with Neyali, Suns' Vanguard, pumping Otharri equal to the number of creatures we have with Kemba's Banner, and pumping the team while protecting them with Nahiri's Resolve