Watch the Jade Monolith in Play Here, I use the Jade Monolith + COP Red combo to completely dominate a red player
Then, whenever Chun-Li attacks, you can copy all of those instants and cast as many of them as you like
You'll also get to make use of any enter-the-battlefield or death triggers those creatures feature (note, as Deadpool's ability is a replacement effect not a triggered ability, Deadpool enters with the text box he's stealing, so can copy ETBs)
It rewards you for attacking with more than one creature and has some interesting interactions with those attacking creatures
Consider that most of our payoff cards can also just trigger by attacking, and its easy to see how you could assemble a fundamentally sound aggro deck while benefiting from these synergies
There is a huge amount of offerings for Pokemon cards on this site, from some of the first base sets to the newest editions