Godfrey, First Elden Lord

First Strike, Trample
When Godfrey enters the battlefield, create Serosh;
A legendary aura enchantment with "Enchanted creature gets +4/+4",
and "All Auras attached to enchanted creature are legendary"
When an aura leaves the battlefield, if it was
attached to a creature, that creature gets +X/+X until end of turn, where X is that aura's converted mana cost. If the aura was legendary, double the value of X.