It triggers every time you cast a spell, providing a Ripple effect, which is usually meaningless for a commander
Queen is immense on defense but it is no where near the game ending power or speed of Avenger
Both characters deal damage simultaneously, equal to their Strength value
Craft: Immediately for Oko and Royal Scions, later as needed for Garruk Copies: 4 for Oko and Royal Scions, 2-3 for Garruk Rare The most important rare is Fabled Passage
There are more complex abilities like Ajani's Welcome giving you one life whenever a creature enters the battlefield, and then really complicated ones like Sphinx of the Second Sun
This creature is great when you have a ton of removal or play it after a board wipe, or if you have many tiny sac fodder creatures