In addition, most of the spells in this set that trigger them tend to be great, including winners like: Thunder Magic Ice Magic Dreams of Laguna (triggers with flashback) Retrieve the Esper Eject Sorceress's Schemes Choco-Comet UR gets to play a ton of good interaction and card advantage, all of which can set up cascading advantages with its value creatures
Why theyre contenders: They are essentially free mana, providing a persistent advantage from turn one
You want your counters to be free and versatile, and unlike An Offer You Cant Refuse, Swan Song, Force of Negation, Flusterstorm, Dispel, and Spell Pierce, this can counter creatures
Were also seeing a token archetype on both sides of the Phyrexian battle
Because when you do, every Puppy-tagged card in your discard pile gets dumped straight into your Inkwell