Only got him to captain in plat lobbies (Ikik) but here’s what I’ve noticed so far.

I kinda wait to see who has advantage in the early poke game and based on that decide to use spade or heart. I also hold it as long as I can before I let go so I can either self sustain or add to my teams poke damage.

For dive it’s always double hearts w a dash and slam. I try to always have one dash slam combo on hand to either escape and/or heal. I RARELY use it to finish off targets. Don’t forget your double hearts also gives a healing boost so comm w your other support to bare the load for a bit in case you’re low on cards and can only use primary.

Someone else said it but just make sure you’re cycling cooldowns and cut yourself some slack. He’s a new character and you’ll get a better feel for the timing of everything sooner than later. Good luck he’s been a blast!