Trapped in the Screen is a flexible removal spell for the mid-game, and for the late-game Kaya, Intangible Slayer is a powerful and flexible utility planeswalker
That being said, Spider-Man did have a (very fringe) modified-matters theme, as seen in heroes like Araa, Heart of the Spider that could attack as a hasty 5/5 with Captain America, Team Leader in play, and cares about counters on it (since a creature with counters is modified)
Conversely, another piece from War that did meet our criteria is Gideon's Sacrifice
Its not under their control and they cant sacrifice it
Wrexial, the Risen Deep + Gyruda, Doom of Depths Wrexial, the Risen Deep is a legendary kraken, but this Dimir commander wants a shell that allows it to attack as unencumbered as possible so you can steal your opponents spells
She's a No Mercy that cannot be answered