The problem is they didn't do it for everyone
SH Shatterfoil C Common XX-Saber Fulhelmknight X EARTH Level 3 [ WarriorTunerEffect ] ATK 1300 DEF 1000 Once while face-up on the field, when an opponent's monster declares an attack: You can target the attacking monster
There's so much looting and rummaging that you get to churn through your deck quickly, reducing variance and making sure you find the cards you need (and discarding the ones you don't) reliably, WITH ONE MAJOR EXCEPTION (see The Bad) It's very consistent
The final ability diverges a bit but forces your opponents to pick one card of a bunch of card types, and then forces them to sacrifice the rest
The Tyranid Swarm Warhammer 40,000 Commander deck, for instance, is an obvious home for All Will Be One
Knowledge Is Your Most Valuable Card : Profit comes from research, not just luck