As with Archivist of Oghma, its really about the card draw, which can reasonably happen two or three times each turn cycle
Its not difficult to have Jetmir drop on the third turn with two other creatures in play (thank you mana dorks), immediately turning on the +1/+0 and vigilance
In fact, since Im nowhere close to 50 years old, its trivial to calculate that Ive spent more of my life as a Magic player than not
With all that said, it's a good enough effect to run twice, even if the second version does remove your commander, so also consider Rolling EarthquakeRolling Earthquake
Gaea's Cradle The best MTG land you can actually play An land only needs to produce two mana when you tap it to be, objectively, broken