Taunting Kobold as an example
Beyond that, the synergies with prowess threats and Dragons Rage Channeler are huge boons for me
Giant creatures with cycling had become a design staple, but Yidaro added an extra element
6 Jace, Wielder of Mysteries War of the Spark introduced static abilities on Planeswalker cards, which made Jace, Wielder of Mysteries an alternative win condition for some decks
At a massive cost of seven ink, its a steel card thats certain to arrive later in the game
Yorion was the premiere companion for 4-color Modern decks revolving around Omnath, Locus of Creation until it was banned, mostly because of the decks rising popularity, but also dexterity issues given the high amount of shuffling in a format full of fetch lands