Legion sleeves are interesting for two reasons
This would normally be a great thing, since MTG sorely lacks quality representation for characters of color and women
Grand Abolisher is the most mana-efficient option, but Kutzil, Malamet Exemplar and Myrel, Shield of Argive provide creature-centric decks additional benefits for more mana
Although Estrid, the Masked is the face commander, the alternate commander Tuvasa the Sunlit is more often what you'll use as your commander instead, as it provides more consistent support by drawing you cards and growing its stats for every enchantment you control
The set also seems to lack an issue like Streets of New Capenna had where one color White was so much better than the others and that at least one archtype was nearly unplayable at times (red/green)
Even as a 4-mana colorless instant, this modal spell gets tons of work done for an Eldrazi player