Other than Spike Feeder, of course which breaks even
Thankfully, Wizards will reveal more information soon, on August 12th, to clear up the current confusion
A slightly more sideways upgrade to Blasphemous Act, Blasphemous Edict does something similar, does it a little better, and sometimes a little worse
The decks are a real blast to play
With any luck, that will happen after I've cleared out my opponents' blockers, but I still want those support cards
Not only does it untap your creatures AND lands (nice), but it also triggers on your own upkeep step: you can respond to that trigger by quickly tapping everything to play instant-speed effects, and then untap and play the rest of your turn normally