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Its usually at the end of a gauntlet like this where youre going to want to take down the difficulty

Life Insurance

While it's true she has no way to restore loyalty, that's not really important, as for three mana you'll be perfectly happy getting one or two uses out of her, then having her sit on the battlefield causing problems

Enchanted creature has "Whenever this creature attacks, if its toughness is 3 or less, put a +1/+1 counter on it.") You don't choose a target for Merry Bards's ability at the time its enters-the-battlefield ability triggers

The downside is, unless you actively want to be dumping your hand into the graveyard, you need creatures with high power in order to make Greater Good worth it