Completing a Wave: The Completionist's Guide (and the BAF Trap)
The last figure in the wave is the one that costs you. Here is how to finish the set without getting taken.
Every collector knows the feeling. You have eleven of the twelve. The shelf looks almost right — and that "almost" is louder than the eleven you already own. Your brain will not let it go. That itch is real, it has a name, and the entire toy industry is built to exploit it. Understanding how completion actually works is how you finish sets you love without paying grail money for a figure that should cost twenty bucks.
This is the completionist's guide: how waves are built, where the cost hides, and how to plan a finish instead of panic-buying the last piece.
Why the last figure always costs the most
It is not your imagination and it is not bad luck. The final figure in a set is systematically the expensive one, for two reasons that compound each other. First, case-pack ratios: figures are not produced in equal numbers. A wave ships with two of the popular character and one of the deep-cut, so the deep-cut is scarcer the day it hits shelves. Second, the completion premium: once a collector has most of a set, they will pay far above market for the final piece, because the value to them is finishing — not the figure itself. Sellers know this. The last figure you need is priced against your itch, not against the market.
The figure you need to finish and the figure someone else needs to finish are the same figure — and you are both willing to overpay for it. That shared desperation is the whole reason the last piece carries a premium. Recognizing it is the first step to not paying it.
How Build-a-Figure waves weaponize completion
The Build-a-Figure — BAF, sometimes called Collect-and-Connect — is the cleverest completion mechanic in the hobby. Marvel Legends popularized it: each figure in the wave includes one piece of a larger figure, and you only get the complete bonus character by buying every figure in the assortment. Buy six or seven figures, assemble a Galactus. Skip one, and you have a Galactus missing a leg.
It is genius marketing because it makes the pegwarmer sell. The least popular figure in the wave is the one packed with the most-wanted BAF piece, so completionists who could not care less about that character buy it anyway — for the limb. The BAF turns "I want six figures" into "I need all seven."
- The full set of figures gets you the complete BAF — the intended, cheapest path if you buy at retail as the wave drops.
- The loose BAF, sold assembled on the secondary market, is the shortcut — but you pay a premium for someone else having done the collecting.
- A single BAF piece (just the leg, just the torso) trades on its own, and the rarest piece — usually the one packed with the popular figure — is the one that holds people up.
The completionist's actual playbook
Finishing a wave well is about sequencing and patience, not speed. The collectors who complete sets without bleeding money follow roughly the same approach.
Buy the hard one first, not last
This is the counterintuitive move that saves the most money. The shortpacked figure only gets more expensive as more collectors get deep into the set and start hunting the same final piece. If you know going in which figure is the chase, buy it early when it is just another figure on the peg — before it becomes everyone's last piece.
Know the case ratio before you start
A wave where every figure packs evenly is a wave you can complete at a steady pace. A wave with a known shortpack is one where you move on that figure the moment you see it. Walking in knowing which is which changes the whole hunt.
Decide loose-vs-sealed before you buy, not during
Completing a wave MOC is a different budget and a different difficulty than completing it loose, and mixing the two leaves you with a shelf that looks inconsistent. Pick the lane up front. The opener finishing a loose set and the MOC collector finishing a sealed run are playing two different games — and the sealed game is almost always the more expensive one.
Use the data to plan the finish
The single biggest completionist mistake is paying the panic price for the last figure when a little patience would have gotten it cheaper. Sold comps tell you whether the price you are seeing is the real market or just the finish-the-set tax. A figure with steady sales at a stable number is one you can wait on. A figure with almost no comps and wild swings is one to grab when a fair one appears, because the next fair one might not come soon.
Completion percentage is satisfying to watch climb — but the last 10% is where collectors overspend. Let the comps, not the itch, set your ceiling on the final piece.
The bottom line
The drive to complete a set is one of the best parts of collecting and one of the easiest to get exploited. Waves are engineered so the last figure costs the most, and BAFs are engineered so you buy figures you never wanted. None of that is a reason to stop — it is a reason to plan. Buy the hard piece early, know your case ratios, pick your lane, and let sold data set your limit on the finish.
FigurePinner is built for exactly this. Track your wave, watch your completion percentage climb, and check the real sold comps on the figures you still need — so when you finally close out the set, you finished it on your terms instead of the seller's.