When you are reliably finding one and winning with it when you just have three then you don't overly need a 4th
Even better is that you can loot when it attacks
This creates a Cataclysm type effect for only creatures, meaning each player ends up with only one creature, but since the "Enter the Battlefield" effect triggers next, that means the remaining creature each player controls is now the strongest creature which ends up also getting destroyed, effectively creating the Wrath of God / Damnation type effect
This type of character is popular nowadays, and Im so glad for the chance to paint her
For example, your opponent is one turns attack away from winning when -- poof -- hes now four turns away
Dragon Tempest massively enhances dragon strategies, while Call the Spirit Dragons is an alternative wincon enchantment for your dragon decks