Each certification number visible on a slab corresponds to a unique, specific item
(2022-06-10) If you control a Background that grants an ability to commander creatures you own, and you own more than one commander creature, each of them will have that ability

2) The engine pieces (how Eldrazi actually happen) Eldrazi Temple and Eye of Ugin style effects that reduce costs or boost mana Spawn/Scion generators (especially the ones that trigger off casting colorless spells) Forsaken Monument type payoffs (mana doubling, life buffer, scaling threats) These are the cards that turn Im playing fair Magic into Im playing 12-mana Magic. 3) The mid-game bruisers (where games are really won) Thought-Knot Seer and Reality Smasher style pressure cards (format dependent) Value Eldrazi that generate bodies, exile cards, or provide pseudo-removal Interaction tools that happen to be colorless-friendly This is the layer that stops your deck from being ramp, ramp, ramp, die. 4) Commander-specific glue (because 99 cards is a lot) Zhulodok, Void Gorger: turns your big spells into double cascade fireworks

This ability has turned the uncommon into a Commander staple and even let it break into Modern a bit, which I guess makes it the most broken card of the year, more or less by default, because there just aren't a ton of good options