If the requirement was 1 Energy less, Swanna would be much more usable, but 3 Energy cards seem like a ludicrous requirement for an attack that doesn't even have a special effect
It has 120 HP and a weakness to Fire, and is closely based on Beedrill from Base Set
They don't always gain life, they don't always hit all your opponents, but one thing is always true: They attack life totals as creatures die
Your eyes do not deceive you, adding 1 red mana is the cost of the upkeep
This easily slots into Steelsong decks, and played after a successful Ariel Spectacular Singer dig means the consistency is there
In other words, we ended up coming to a more complex design because that's where the flavor of the world led us, and we were willing to give it a try because of where Ikoria falls calendar-wise