I prefer such abilities to trigger during the upkeep step, because nearly every other ability triggers during that step, and, as far as I am aware, there are very few abilities that trigger during the draw step, apart from additional card drawing, so everything would be easier and more uniform if the upkeep step was the universal (or near universal) step during which abilities triggered
Oddly, there wasnt actually a deck minimum if you dont count being required to have a deck as being the lower limit
Eldrazi Conscription
Tokens can be sacrificed
It was called the Alpha Playtest, and according to Joel, Richard Garfield likely still has all of those playtest cards
Reckoner Bankbuster You probably know Reckoner Bankbuster from its long, banworthy stint in Standard, though I encourage players to test it out in Commander too, especially in decks seeking more card advantage