Muse Seeker is worse due being much more fragile, however looting is more powerful than rummaging, which somewhat compensates
Much like the last scene, none of these cards look strong enough to see play in Legacy or Vintage
Importantly, these are not the lands themselves, and they shouldnt be included in your deck as part of your land counts, unlike the Modern Horizons 3 land cyclers, which cost one mana to cycle
Anything that can keep your cards alive for an extra round is worth having in your deck
The D23 promo version of Maleficent, Monstrous Dragon, and every other promo from the event are likely to maintain their value over time, making them solid investments if you happen to have a few in your collection.