If there are profitable creatures to sacrifice, Butcher will be that much better
The main drawback is the reconfiguring cost, which is two generic mana plus two black mana for a total of four mana in addition to the two mana casting cost
There are other options for loops like this, the best ones being Glen-Elendra Archmage, River Kelpie, and Geralf's Mindcrusher, but each requires a free Land sac outlet (e.g
Even if you use this ability on the turn you cast Liliana, Deaths Majesty, you are left with a Planeswalker and any creature from your graveyard
Well theyre not endless, as Urusula, Deciever of All can only sing songs of cost three or less, but regardless thats a big old toolbox to work with and I think players are going to be very tempted to start singing in emerald from now on
This means that when making a discard spell, always make it a sorcery unless it can only function as an instant