Lets look towards the heavens to see how gods work in Magic, and no, Im not talking about the RNG gods you pray to when you need to topdeck a land
You choose a target for that ability as it goes on the stack
Obscura Interceptor offers something a little more than that, though, because it can connive
For example, you could play the ten Shadowmoor filter lands, the Ravnica shock lands, and the ten fetch lands
Anytime someone has to break out the layers concept in MTG you know its about to be confusing
That means that if you play Frodo, Determined Hero when Swiftfoot Boots is in play - which grants hexproof and haste - you can attack straight away and it cant be targeted, and the attack will trigger the effect again, allowing you to put another equipment card on the Ring-bearer