Hylda of the Icy Crown's ability will trigger only when an effect instructs you to tap an opponent's creature
Its highly likely the company wont ever release any new Pokmon Master Ball Mirrors in the future, hence why it goes for more than most of the URs, SARs, and SRs in the setlist, starting at ~US$223 on the SNKRDUNK App
For a birthday, event, or last-minute gift, that turnaround is genuinely hard to beat from any custom print company
This is infinitely better than letting your opponent hit you first to fulfill this condition
First, in any deck that chooses to play with Molten Vortex, it's likely to be a key card
When you use this move you have to flip a coin, if you get a heads, Snorlax and the defending Pokemon are asleep, if you get a tails Snorlax is asleep