Consider its card type, any effects that modify when you could cast it (such as flash), and any other effects that stop you from casting it (such as from Meddling Mage's ability) to determine if and when you can do this
The cards ability to recur permanents like Mishras Bauble created a card-advantage engine that few archetypes could overcome, often providing a two-for-one exchange before the opponent could even cast a removal spell
Blue has all the good cheap card quality stuff normally and so access to that kind of thing outside of blue is a big deal
Oath of Gideon: Some folks might play it simply for the Ally tokens it generates
Danitha Capashen, Paragon can work as a more than decent commander for a knight deck with a strong aura and enchantment subtheme
Light The Fuse lets you deal 1 damage to a chosen character for each exerted character you have in play, while The Sword of Shan-Yu has you exert a character to then ready another chosen character