How competitive do you want to be? Kruphix can be fun at medium power levels, while Thrasios/Kydele can be more competitive, and Tatyova and Arixmethes have land synergies too.
July 11, 2019 4:13 p.m.
Thrasios + any other partner would probably be best
July 11, 2019 5:02 p.m. Edited.
Momir Vig, Simic Visionary but only if your winning with palinchron primarily.
July 12, 2019 3:17 p.m.
Best as in most fun or best as in most cut throat?
1) Tharasios (even by himself) his ability is great for sinking all the mana you're going to make in a high tide deck.
2) Rashmi - not as good of a mana sync but allows you to dig for pieces and makes you really think about how to manipulate your top deck
3) kruphix- allows for a more proactive plan and if he sticks around is a pretty decent mana sync
July 12, 2019 5:27 p.m.
Prime Speaker Vannifar can grab Spellseeker at X=3 to fetch High Tide from the command zone. Any creatures you add in the deck can serve as toolbox answers/support for your high tide. Rashmi does seem like the best choice overall though, that card advantage will keep you going!
Also, some slept on cards for high tide that you may find interesting regardless of what commander you choose Early Harvest Bond of Insight Turnabout Heartbeat of Spring Flood of Recollection Mission Briefing