mtg modern card list Blue Flying Creature Deck - Powerful - Legal - Custom Built - Elite Hydra Deck - Mono

Despite Grixis Shadow being currently maybe the strongest deck in the format (thanks to Lurrus obviously) I think Deaths Shadow is not the correct way how you want to approach your tempo deck in the future

Mind Flayarrrs(Blue-Black)

What set is Oltec Matterweaver from

The rest of the deck is made up of a new mechanic called Villainous choice, which has your opponents choose between picking an option that hurts them or benefits you, and then the powerful myriad ability to make sure youre sharing the pain across all players

Captain N'ghathrod Captain N'ghathrod is a commander that provides value every turn if youre milling opponents