Just make sure your friends leave Necron Dynasties to you, because this deck is going to be one fearsome adversary
Its perhaps not best-suited to newcomers since it requires keeping tabs on a lot of counters (often different types), but by spending some time planning, you can create Summon creatures and keep them on the board much longer than expected, while also powering up just about everything on your board
The marks can be more visible on sleeves with decorations or a complex artwork and they can thus be considered as a way to cheat during the game
The foretell aspect eases the pain of the high cost and can let you setup for some big turns
This Dimir (Blue/Black) deck utilizes a relentless "Zombie Tribal" and graveyard recursion strategy
Creature - Skeleton Pirate Anthem (CTRL to add secondary) Drain Syr Konrad, the Grim Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad deals 1 damage to each opponent