This is because on the latter you can set up stops on each step you want to pause, regardless of the stage of the game, whether the upkeep, precombat main phase, end step, and so on
Just giving each artist a box of booster packs wouldnt guarantee that we get examples of our own art on finished cards
Illuminor Szeras Ol' Szeras here is kinda the reason why the entire Necrontyr civilization is cursed (or blessed as some might see it) with eternal robotic undeath
As a tournament player, Id rather have fewer formats at this pointI have most cards for several Modern and Pioneer decks, but I dont even know if I have everything Id need for any deck Id want to play in either format
Village Rites offers a similar effect for a lower upfront cost, but not allowing you to sacrifice an artifact makes it a bit less flexible, and the Treasure is a huge addition to this effect