Number 380 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (2/4/2023) Encroaching Mycosynth turns all permanents you control into artifacts
Making Cavern of Souls your source of creature spell mana protects you, as when they are cast using this mana, it also blocks them from being countered
In addition, most of the spells in this set that trigger them tend to be great, including winners like: Thunder Magic Ice Magic Dreams of Laguna (triggers with flashback) Retrieve the Esper Eject Sorceress's Schemes Choco-Comet UR gets to play a ton of good interaction and card advantage, all of which can set up cascading advantages with its value creatures
What set is Murkfiend Liege from
Whelming Wave was the design team being as unsubtle as possible