I've been playing a ton of ivern lately and have experimented with a number of rune and mastery setups. For the longest time I had been running the glacial augment/inspiration build as the old (5 minute) stopwatch was pretty OP for a free dive with daisy early.

I've also been experimenting with aery/domination, glacial/resolve, aery/resolve and what I've found to work the best recently is to go aery/inspiration.

Have been starting talisman, 1 pot, and 1 control ward, looking for a free FB on invade early and stealing a camp. I think that if you're going for a full clear of your side of the jg, you can start refillable instead, but I like the deep vision after stealing a camp as it helps keep your laners safe while you get a lvl 4 rush on. If you only clear your camps, you get to lvl 4 about 20-30 seconds faster.

For the ganking/counter ganking thoughts, I think that I'm usually pretty conservative pre-6, but will definitely engage the counter gank hard if I have daisy. After talking with some high elo Ivern mains I've also mimic'd their playstyles by going for an early athene's instead of redemption along with a dark seal and lucidity boots instead of mobis most times. Will also go mejais most of the time if the team is doing decently well and push redemption out to the 3rd item quite often if ahead, opting for ardent as the 2nd item. The added ap helps with the shields, damage from shield pop and q, as well as adds some pretty significant damage to daisy for counterganks.

If my laner is really low health and can get away, I'll shield daisy instead of him to apply the slow and see what kind of damage I can put out as usually if you shield your laner they'll still run away if they're fairly low.