As I mentioned in another post, Ive managed to acquire a few packs of Disney Lorcana cards at various D23 events in the last year
Doran, the Siege Tower lets your creatures deal damage with their toughness instead of with their power
This isn't really a tribal-specific suggestion, but Cloudstone Curio or anything to get more ETBs out of Tazri and other allies like Conjurer's Closet
Amber Amber glimmers are purposeful
Im not going to tell anyone how to have fun here, and I respect Serge a lot and in his playgroup, perhaps they enjoy tight gameplay that gets them through lots of turns quickly but 45 minutes seems woefully inadequate
If your Commander deck doesnt have access to black and its array of universal tutors, focus on choosing low mana value tutors that fit in well with your strategy (for example, dont play Idyllic Tutor when your deck only has 4 enchantments unless theyre of critical importance)