The dexterity game that Clay Pigeon uses is probably a bit too unforgiving
Fire, Fira, Firaga), or the merging of Sagas and Creatures to create the sets Summons , temporary invocations with multi-turn boons that can also help out in a scrap
Aven Interrupter I mistakenly think of Aven Interrupter as another O-ring effect, but it operates more like a white counterspell
Honorable Mention: Incubator Tokens The Incubator tokens from March of the Machine featured on some of the strongest cards from 2023 (Chrome Host Seedshark, Sunfall), to the point where they almost overshadowed the big splashy battle mechanic from the same set
The joy of collecting or playing for fun is no longer the point its all about maximising value
Ruby Ruby really doesnt need more overpowered cards, and its somewhat relieving that Shimmering Skies hasnt given them any