how many cards are in a mtg deck The of Things (Custom Caravan Deck) (Fallout) | Secret Lair Drop Return a card at random from your graveyard to your hand MTG card sees 186% price

I dont think Days Undoing is actually busted or anything, but I think its actually going to see play (often out of sideboards, such as the Blue Devotion deck above)

2016-11-08 If Conquerer's Flail is attached to a creature you control and you activate its equip ability targeting another creature you control, there's no time in between activating that ability and the resolution of that ability during which it's not attached to a creature

Honorable Mention 3 I'm calling this the Angel Tax group - cards which punish your opponents in some way

With Bloodthirsty Conqueror, you can add more redundancy to this life drain combo