What are people's favourite discard outlets? Presumably Faithless Looting?
Merfolk Looter is probably still the best. I mean, it doesn't attack, but it gives you control over when you discard the card (nice with madness or playing around a Scavenging Ooze. Magus of the Bazaar is pretty badass and maybe I should play him. Faithless Looting, Looter il-Kor, Attunement, wild mongrel, firestorm, Lotleth Troll and Wheel of Fortune are all reasonable discard outlets.
Activate Thought Courier, trigger on the stack bounce it with Riptide Laboratory, discard it to its own activation.