There are few instances where being an enchantment is relevant and much like with Sicken, the value of just making something you can't kill a bit smaller in an ongoing capacity is pretty weak
Zombie decks in particular make good use of amass zombies, and were bound to see more creature types supported in the future
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The only exception would be a card with rules text like each creature with myriad has flying since it has to do with the myriad keyword, not how many opponents you have
At three mana, it also isn't very expensive to get on the field, and can go over opponents without enchantment interaction very easily
With Monstrous Rage no longer available, the current form of red aggro favors burn-type effects over pump spells, which is definitely the way I prefer it