mtg card size Katomula 100 Sleeves with 100 Inner Sleeves, Textured Back Art, Fit Standard Cards Standard Playing Card Size: Guide

The other point of relevance for Noble Hierarch is its typeline: Human

They are restricted too, so also only one copy can be in your deck

Once tied directly to the investigate keyword, since Avatar WotC has decided they can be their own thing, and just use investigate when the mystery/detective vibes fit the particular set

Ukkima, on the other hand, is an unblockable enabler that ALSO deals damage when it leaves the battlefield

Your first thought is wondering why they're playing a Wrath of God and not a better board wipe, but then your second thought is how you're going to save your most important creatures from the devastation