This was an intentional choice during development
Best Lorcana emerald cards Mother Gothel, Selfish Manipulator Flynn Rider, Charming Rogue Mad Hatter, Gracious Host Cheshire Cat, Not All There Genie, Powers Unleashed Jasper, Common Crook Kuzco, Temperamental Emperor Emerald cards in Lorcana are especially great if you prefer to fend off attacks from other players, using effects that fill your hand with cards or banish opposing characters whenever youre attacking - forcing your opponents into tricky decisions about what theyre willing to sacrifice to slow you down
And even then examine whether the card needs to be made if it can only be an instant
Most of my playing time has been dedicated to Modern, where the most powerful control spells are housed and the mana to bring them into reality
But it's still only one creature, so if it's destroyed, there's one trigger for a creature dying, even though multiple creature cards will enter the graveyard from the battlefield