Esika is a three-mana mana dork that grants your other legendary creatures vigilance and the ability to also tap for any color of mana
You can create an easy infinite sacrifice loop with Boromir, Warden of the Tower, and Saffi Eriksdotter, though Saffi, a free sacrifice outlet la Goblin Bombardment, and any legend that costs more than 3 mana enables the same loop
Not too fussed about upcoming stuff
If this white creature were printed into Standard, Id likely be singing its praises as a niche playable
They function differently from everything else, making them harder to evaluate
Instant speed Reanimator effects are few and far between for such a low mana value, and if you do want to target anything bigger than a mana value of 3, you can bring it back to your hand to save it from a graveyard disrupting effect