The value of X is calculated only once, as Imskir Iron-Eater's triggered ability resolves
This is a really near Werewolf lord effect, and leans into one of my favorite things in all of Magic - mechanically unique lord effects
This means that from mid-August through the first of September, local brick-and-mortars will have an advantage over places like Best Buy and Wal-Mart
Legendary Creature - Human Scientist Red XIII, Proud Warrior Vigilance, trample Other modified creatures you control have vigilance and trample
Many, many wizards care about casting spells, which makes them best friends with cheap cantrips like Ponder and Brainstorm
Honesty fosters trust, and a single bad trade can tarnish your reputation in local or online communities