For two mana, Vivi's Persistence creates a 0/1 black Wizard creature token that deals one damage to each opponent whenever its controller casts a noncreature spell
When this resolves, it buffs all your other dragons with a +1/+1 bonus, and the fact that storm makes copies of iteach one a tokenmeans you can suddenly have a sky full of fire-breathing threats that act as lords for others of their kind, going from a single pump to a massive Craterhoof Behemoth buff
Creatures can still attack you while you have protection from everything, although combat damage that they would deal to you will be prevented
If a replacement effect (such as that of Leyline of the Void) causes any of the sacrificed creatures to be exiled instead of put into a graveyard, those cards aren't returned to the battlefield.
You can obtain the Meltan (1-Diamond rarity) card by opening Eevee Grove from Eevee Grove set
In an ordinary game of chess, deciding whether white has a winning strategy is also computable
