magic the gathering khans of tarkir booster box discover which clan fits your playstyle with distinct three Tarkir: Dragonstorm Collector Booster Box

You can see the full event details and the prize breakdown in The Brothers' War Mixed Limited Arena Open article

This protector is shaped to match standard case dimensions, so it sits evenly and stays in place

Added Pipe Network

Not that Ill say that theyre rarer than 1st Edition holos, but I feel a case could - and perhaps even should - be made for them being rarer than Shadowless

[All Turns] [Once Per Turn] When a card is removed from your security stack, if you have 3 or fewer security cards, you may place 1 yellow card from your hand at the top or bottom of your security stack

How did the collecting phenomenon begin