Having a permanent blocker that can (almost) never die makes for an excellent defensive tool, and one that can eventually become a significant offensive threat later
If the chosen creature is copying something else, other creatures you control become copies of whatever the chosen creature is copying
For example, if you tap a creature with a mana ability to pay part of the spell's enweb cost, you could also return that creature to hand to pay the cost
Keeping in mind that lands do not have a color identity, its likely that youll be gaining a good chunk of life whenever you cast this spell, even if you dont control a ton of other non-land permanents
Giclee Print of Avacyn, Angel of Hope illustrated by Jason Chan for the Avacyn Restored expansion of Magic: the Gathering
Dont worry too much about buffing its power for more expensive taxes: it turns out a Rhystic Study that can only trigger once per turn per opponent on noncreature spells is still pretty good