Originally Posted by 
silkster
				 
			As someone who has also submitted an illegal Grist, I feel you.
Swamp gives you the mana to cast Mana Crypt, but you still only have 4 total which isn't enough to cast Daretti while paying the 2 extra. So these matches should be DL. But I did the scores for Smashmaster too, so someone should double check this. Crucially, the difference between DD and WD for RoosterCocoa is the difference between making and not making the banlist cut off.
On the play, you get 5 turns before the first footfalls lands. So you can tick Daretti up to 8 and have 5 1/1s. Then you can sac the crypt to kill one Rhino, and block the next with 4 1/1s. Now you have Daretti at 6 loyalty with no creatures facing two Rhinos. Perhaps you thought you could be single blocking them while using more -2s, but the Rhinos have trample.