This card would be beneficial in a tribal-themed deck that focuses on casting multiple creature spells of different types, as it allows you to diversify your creature types and potentially trigger various tribal synergies
Second, the player who goes first may not play a Supporter until their next turn
Call of the Ring + Ripples of Undeath Call of the Ring and Ripples of Undeath don't let you pay life en masse for a combo turn, but they're excellent to consistently trigger payoffs like Font of Agonies and Betor, Ancestor's Voice
As a doctors companion, it also pairs well with legendary doctor creatures for flavorful Commander builds
For example, there can be cards that appear in one type of booster but not the other
Starting with the good, aside from two cards were going to get into later on, Kaldheim is a pretty well-balanced set