I wonder a little if this type of fun rarity in tabletop games doesnt work for crowdfunding but can work otherwise in select situations
So while one day a deck might be classified as Aggro, if faster decks get created it might shift to being considered Tempo or Midrange by comparison
Atsushi, the Blazing Sky Chiss-Goria, Forge Tyrant Dragonhawk, Fate's Tempest Drakuseth, Maw of Flames Fang, Roku's Companion Fin Fang Foom Gadrak, the Crown-Scourge Ganax, Astral Hunter Inferno of the Star Mounts Khorvath Brightflame Lathliss, Dragon Queen Livaan, Cultist of Tiamat Ran and Shaw Rorix Bladewing Ryusei, the Falling Star Stet, Draconic Proofreader Tarox Bladewing Verix Bladewing
Harrows the classic, and it puts lands into play untapped but also folds hard to counterspells
The built-in exile at end step or leaving the battlefield clause on Unearth is another key limitation, which is why your best targets for this are creatures which can have massive impact inside of one turn
Doctor's companion (You can have two commanders if the other is the Doctor.) How much does Donna Noble cost