In a Satoru Umezawa Duel Commander deck, or if youre facing your final opponent in a regular Commander match, you close out the game with Trench Gorger by replacing an unblockable creature like Triton Shorestalker and digging through your deck to make it as big as you can
Broken Mass-Mana Lands Tolarian Academy is banned for a reason, and Gaea's Cradle/Serra's Sanctum arent too far off
However, Kenrith, the Returned King is one of the most versatile commanders, and there are plenty of builds meant to interact with the whole table in fun ways
That means the least I can do is recommend the best of Infect for your deck
The flavor is the creature creates a shadow version of itself upon dying, meaning the creature has to be killed twice
Each of these lands is good in its own way and has a place in some decks, so dont worry if you dont have access to the top-tier cards