urza's saga booster box tournament legal set to be printed under the then Urza's Destiny - Booster Box

Masked HERO Atomic Level 8 FIRE Warrior Fusion Effect Monster ATK/ 2600 DEF/ 2000 Must be Special Summoned with Mask Change

Heatmor costs 35 Pack Points to craft

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If you decide to try and make your own version I would suggest changing the category so as to avoid potential problems

Previous Secret Lair drops have had corresponding MTG Arena card sleeves, so the theory that they could be following that model makes sense

But it's not "at all" kind to your wallet, isn't it