Conjurers Closet and Thassa, Deep-Dwelling will be some of the easiest ways to guarantee Lavinia keeps cheap permanents on lockdown, but having a suite of blink spells to back them up is never going to be a bad thing especially since it wont take long for Lavinia to become a priority removal target for the rest of the table
This is huge card for helping keep all these low curve cards that have been dominating the format in check
Tiered puts each tier of these elemental spells onto the same modal spell
Theres also a space for legends and +1/+1 counters this might be a good Golgari commander for, including cards like Reyhan, Last of the Abzan, Grakmaw, Skyclave Ravager, Polukranos, Unchained, Rishkar, Peema Renegade, Kodama of the West Tree, Renata, Called to the Hunt, and plenty of others
Instead, Odin is contained within Zantetsuken, and any who wields the sword becomes possessed by Odin