By the point in the game where blue decks are able to activate a manland, theyd much rather have a beefy creature with ward than a smaller creature with flying, unblockable, or hexproof
The best payoffs are ones that put counters on themselves (like Tellah, Great Sage and The Emperor of Palamecia) for casting expensive noncreature spells to make them bigger combat threats
What an eerie effect actually does on triggering will depend on the card
If youre a deck that cares about vehicles youre likely already running this, but if you are in the realms of extra combats, double strike, flying, or flicker
She hesitated during their confrontation, but lost control in a fit of rage when she realized the senior baron was experimenting on her deceased mother