Notably, if Sidar Jabari is on the battlefield and its eminence ability triggers, but it's put into the command zone before that ability resolves, that ability won't do anything as it resolves
For a more detailed breakdown of how we evaluate cards, see our Card Condition Guide

[15] [16] There are twelve tokens and one emblem in the set: 1/1 Human creature for Hero of Precinct One and Watchful Giant 0/2 Illusion creature with "Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step." for Mesmerizing Benthid 2/2 Zombie creature for Awaken the Erstwhile and Captive Audience 1/1 Goblin creature for Goblin Gathering 3/3 Centaur creature for Rampage of the Clans 3/3 Frog Lizard creature for Incongruity 2/2 Ooze creature for Biogenic Ooze 4/4 Beast creature with trample for Domri, Chaos Bringer and Threat 4/4 Sphinx creature with flying and vigilance for Warden 1/1 Spirit creature with flying for Ethereal Absolution, Knight of the Last Breath and all creatures with afterlife 1/1 Thopter artifact creature with flying for Dovin, Grand Arbiter and Deploy Treasure artifact with ", Sacrifice this artifact: Add one mana of any color." for Smothering Tithe Emblem for Domri, Chaos Bringer Mythic Edition[] Ravnica Allegiance Mythic Edition is a special draft-sized booster box

This also comes up whenever your opponents top of library is known
The mana value of a melded permanent is the sum of the mana values of its front faces
This is a subtle reason but a very important one