Within Temporal Forces, this is one of the SIRs people actually open packs hoping to hit, which is why most builders just buy the single rather than chase it
Illustrated by Matt Stewart Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
The two most common Commanders we see with it are Niambi, Faithful Healer, probably for Akosa Family Tree reasons, or Taniwha, likely about Mirage set theme reasons
Ally of Justice Cosmic Gateway X DARK Level 8 [ Machine / Effect ] ATK 2400 DEF 1200 If your opponent controls 2 or more monsters including a LIGHT monster, you can Special Summon this card (from your hand)
Any card exiled by Knowledge Pool's "enters" ability or its other triggered ability may be cast
However, due to the effect of (2), it cannot be activated unless it is in a mutual link state, so be careful