mtg signed art cards phyrexia all will be one Phyrexian Arena Card (Gold-Stamped Signature) - Art Series: Phyrexia: The Invasion Tree broke through the Blind Eternities and sent Phyrexian perfection coursing across the Multiverse. MTG Phyrexia All Will Be

That includes your opponents Creatures, and its a great way to just gain life like some kind of side hustle

Mu Yanling, Wind Rider Fliers matter when youre playing Mu Yanling, Wind Rider: They give you cards when they deal combat damage to a player

The specifics of the cards in your deck is up to you, but if youre struggling for inspiration then sites such as EDHREC can help massively thanks to the huge amount of data they collate and the rule of the masses

The non-foil version will retail for $29.99 and the foil version will cost $39.99

Very solid card, and great for enabling the modified deck, too

You don't build around it, you use it to support what you're already building