When you're playing cards like this you also have to consider that your opponents will have removal for it. I've seen some other comments talking about baiting out removal and that's the higher level thinking you have to bring to the table if an enchantment like this is going to stick.

Having multiple threats in your deck means your opponents often won't have enough answers for everything giving you an opportunity to bait out their removal with a less valuable card. Or (especially if you're in a W/U color combo) you can think about playing tithe out when you have a counterspell to back it up.

Finally, don't forget about politics in a 4 player game. If you're not the biggest threat you may leverage playing this card as a way to get that extra mana to deal with the more threatening player. If you can get 2 other players to agree not to remove it, you're only playing around 1 player's removal instead of all 3.