Hmm, I wasn't specifically farming for the item since I don't really care about minions, but I don't think I got a fenrir pup until I completed around 300-400 Feast matches.

About 600 runs of Garuda to get Nightmare. (Got all three tank mounts from that fight haha, I guess the number would be a bit higher for the times I farmed Titan and Ifrit for their horses too)

And about 50 runs of a specific expert roulette, can't remember which, for some glamour item somewhere around 3.3.

Outside of those though I've had pretty good luck in general for most stuff.