Since Captivating Vampire's activated ability doesn't have a tap symbol in its cost, you can tap a Vampire (including Captivating Vampire itself) that hasn't been under your control since your most recent turn began to pay the cost
Profiting from their demise, the Crystal returns the creatures to your side for a heavy cost, but a little warped and stronger than before
But the real reason I like this is that while a lot of battles give you something unexciting on the back, this has the potential to copy something appropriately impactful for a game of Commander
If that creature is no longer on the battlefield when Monstrous Emergence resolves, use that creature's power as it last existed on the battlefield to determine how much damage is dealt
The developers should be commended for adapting a mechanic so well to the tabletop game, in a way that matches the source material, while still feeling like it belongs in Magic
Custom Handmade Secret Lair x Stranger Things proxies made from real Magic the Gathering card with many different alternated arts available for purchase.