how to tell if a mtg card is mythic 25 Random Rare Cards Foils/Mythics/Planeswalkers : Toys & Games Understanding Card Rarity in MTG:

If a card does something to all characters, all type/class/name characters, and doesnt require choosing Vanish isnt triggered

Only when you cant use your Burn spells on creatures they become useless and in some cases that means you should sideboard them out for REBs, Blood Moon or something else

You already have this for your EDH deck if it fits, most likely

It is generally acceptable to create and use proxy cards for personal use , such as playtesting (kitchen table Magic) and friendly battles with friends

Even better, it does this by flickering itself, triggering all your constellation style effects like on Doomwake Giant, etc