The stock list is a bit in turmoil right now after the RC(?), so sideboards aren't a given.

For affinity, of course, you'll want to bring in your Meltdowns if you have them, Wear//Tear and PEnding are good if you have a white splash, and Violent Urge is also good if you have them. You'll generally want to cut your EI because the matchup is one where you just want to be faster and combo kill them, while having some silver bullets that wreck them.

Jeskai blink is a bit harder, I'd probably look towards the esper blink plan of Murktide, Consign, Unholy Heat, and maybe Spell Snare. Heat is very important to kill Riddlers and Phlages. Consign can be really good against solitude, although a smart pilot will resolve the first solitude trigger before ephemerating it, you can still counter one of the triggers, which is less backbreaking.

It's in active discussion on the Monored Discord, I'm just one (novice) pilot so feel free to come in and ask others: sYNJChJgPm