It may not deal more damage over an arbitrary number of turns, but it is REAL good at deciding who takes 20 damage FIRST Is very difficult to interact with
We also have mana-fixing lands that come into play untapped: the checkland cycle (Sunpetal Grove)
I also really like this leading a Pinger deck where you tap a Prodigal Pyromancer to shoot your team for a damage, and make sure you are running things that will take the damage into good stuff like Stuffy Doll, Brash Taunter, and the enraging Dinosaurs Bellowing Aegisaur and Sun-Crowned Hunters
Ultimately, the decision to include Ice-Fang Coatl would depend on the specific strategy and synergies of the deck, but it definitely has the potential to see play in the right context
I am all in
I will argue, though, that what really killed the hype for Set Champs was the fact that the prize card, Mirabel, Family Gatherer, was and still is completely unplayable