We can quickly fill our graveyard with any of blues looting spells, like Ideas Unbound and Frantic Search, then make Rex unblockable with whites protection spells and blues unblockable cantrips
Because Standards power level is so much higher than usual, Wizards is either forced to print absurdly powerful cards or ban cards altogether to keep things interesting
Imagine casting Maddening Cacophony and then the Cooperate portion with Bruvac the Grandiloquent already on the battlefield
I love big bold card names, and this is so thematic it hurts, but it also looks like its got the same issue as the Creepshow SLD: If you make a frame with wrinkles and frayed edges (comic book, newspaper, etc.) then the cards always look like they are LP or worse
the Weaponcraft Enthusiast is a 0/1 Aetherborn Artificer with the Fabricate 2 ability and a casting cost of two generic and one Black mana
Card rarity comes down to the mechanics