yugioh blair deck Complete Custom for Yu-Gi-Oh! Yu-Gi-Oh Anime Recipes on X:

Aside from a couple of bits of removal and some ramp, the main ones of note are Praetors Counsel and Triumph of the Hordes

Lier, Disciple of the Drowned Making all spells uncounterable can be a downside for a mono-blue deck, as countermagic is their primary form of interaction

Rowan, Scion of War have its place in Commander, and Rowan, Scion of War pulls it off with aplomb, facilitating huge, potentially game-ending plays with ease

Gwenom, Remorseless (SPM) $28.50 Gwenom, Remorseless is one of the best cards in the regular set, one that does a good Bolas's Citadel impression if it attacks

Card not found was a functional reprint of Card not found from the previous Portal

It seems unlikely that this card has a major impact on any format