Yurlok of Scorch Thrash without summoning sickness and
Thornbite Staff attached to
Yurlok).
Easy Prerequisites
You control a nontoken creature and have a creature card in your graveyard which have a collective mana value of 6 or less.
Steps
Activate
Yurlok by paying ({1} magic symbol) and tapping it, causing each player to add ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .
Cast
Chthonian Nightmare by paying ({1} magic symbol) ({B} magic symbol) . When it enters the battlefield, it triggers, causing you to get ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) .
Activate
Chthonian Nightmare by paying an amount of ({E} magic symbol) , sacrificing an additional nontoken creature, and returning
Chthonian Nightmare from the battlefield to your hand.
When the creature dies,
Yurlok triggers, untapping
Yurlok.
Resolve the
Chthonian Nightmare trigger, returning another creature from your graveyard to the battlefield.
Repeat.
Notes
Once you move to the next step or phase, each opponent will lose the unspent mana in their mana pools, and lose that much life due to
Yurlok. This combo may require some additional ({E} magic symbol) if the first creature you sacrifice has a mana value above 3.