phyrexian card sleeves Hypttior MTG - Deathclaw The hologram foil will shimmer and produce rainbow heart patterns as your viewing angle changes Phyrexian Card Sleeves - Etsy

However, this has delve and seven generic mana, so if you exile stuff from your graveyard as you cast this, this could be as cheap as a single mana

It has since been sold for a best offer, so the final price is unclear, but according to the third-party tool 130point it may have been closer to $40,000

Card Sleeves 1-3 3 Card Sleeves (200 ) YSL-ZEXAL013 400.00 YSL-ZEXAL014 300.00 YSL-ZEXAL014-U 300.00 YSL-ZEXAL015 350.00 YSL-ZEXAL016 350.00 CG1366-100% 350.00 300.00 CG1366-95% 20.00 YSL-ZEXAL019-U 1,200.00 YSL-ZEXAL020 350.00 300.00 YSL-ZEXAL021 90.00 YSL-ZEXAL022 2,000.00 YSL-ZEXAL023 500.00 YSL-ZEXAL024 400.00 YSL-ZEXAL025 350.00 YSL-ZEXAL026 1,200.00 YSL-ZEXAL026(02) 880.00 YSL-ZEXAL027 350.00 YSL-ZEXAL028 350.00 YSL-ZEXAL029(01) 400.00 CG1412 400.00 41-60 200

The answer is Q: I cast Bloodbraid Elf, and I cascade into Valki, God of Lies