Along with Shift, Diablo has the Evasive keyword, which means that he can be challenged only if the opposing character has the same keyword
It's a great deck for players who enjoy having an ample supply of mana to overwhelm their opponents with
Fable of the Mirror-Breaker showed us that we can take a sec for a 3-mana enchantment if it pays us back
But those are possibilities if you want them, be aware it will create a lot of additional interactions with your planeswalker, both ways to synergize with it, tutor it or cheat it into play and removal
Secret Lair is an ideal holiday gift for any serious Magic player and collector
Edgar, Master Machinist Wizards clearly went out of their way to make Edgar, Master Machinist fair, between the once-per-turn clause and the fact that the artifact it casts enters tapped, but I refuse to believe that we cant crack this like an egg we should probably start with Krark-Clan Ironworks