I have a similar BUG (Sultai) Gerlander deck, but with fewer creatures and slightly "slower" gameplan. Which cards would you add from the Maybeboard, and which ones would you cut based on your experiences in playing with Sultai?

If I were you, I'd add Treasure Cruise and Narset, Parter of Veils into your deck, because both give nice card advantage. Maybe even consider Birds of Paradise to help speed up the early game vs. fast decks.

Hi Kumaisteri

About those of your suggestions. I have been testing Narset, Parter of Veils by cutting Coercive Portal and she has been amazing and is here to stay but I don't know what is right to cut. I have also been testing Treasure Cruise by cutting Tasigur, the Golden Fang because Karakas has been showing its head.

And now to your maybeboard.

• First is that I would switch Liliana of the Veil because in a controlling deck Liliana, the Last Hope is just amazing because she makes combat unbearable for opponents + she is card advantage and win condition.
• I haven't had good time with Chart a Course and I feel like that it is more tempo card and I would replace it with Gitaxian Probe
• Search for Azcanta  ^Flip is just too good not to play. I would cut Ashiok, Dream Render because I tested her in 2 tournaments and I drew her 8 times and never wanted to play her even on to empty field.
• I would change Liliana's Triumph to Collective Brutality because there aren't many creatures that you need to kill with sacrifice (True name, Mirran Crusader are the biggest)
• For some reason I have had hard time finding enough cards in graveyard to support 3 big delve creatures + tarmo + azcanta so I would suggest trying to cut Tasigur, the Golden Fang to Scavenging Ooze
• This may be only personal preference but I don't like Pernicious Deed in sultai for some reason and I would suggest giving change to Courser of Kruphix or Spellseeker
• For your manabase I would suggest adding more colored lands like fast lands Blooming Marsh Botanical Sanctum Darkslick Shores and cutting Volrath's Stronghold , Temple of Mystery and then either one of these Bojuka Bog or Sunken Hollow and Urborg, Tomb of Yawgmoth for Tectonic Edge . Personally I wouldn't even play Field of Ruin but it can fix and is good enough
• I wouldn't add Coiling Oracle any more because Modern Horizons is bringing us Ice-Fang Coatl that is just sadly supreme version of Oracle (crying because it is my pet card)
• Sakura-Tribe Elder , Shriekmaw and Recurring Nightmare are more rock like strategy and don't fit in + Nightmare is shit if you don't have enough creatures
• I would suggest to test Glen Elendra Archmage and Catacomb Sifter depending what your meta is like. Oh and Eldritch Evolution is extremely powerful card but I am not sure of it because you don't have as many creatures.

Otherwise your deck seems solid more controlling sultai that will win games.

I hope that I answered your question well enough. Also remember that these are just suggestions and not absolute do things and some cards may be better in different meta games.