Korvold, the Cursed Goblin King (EDH / Commander)

Combos Text copied because lazy :)

Lists

• Persist Combo
  Metallic Mimic/Grumgully, the Generous + Putrid Goblin/Murderous Redcap + Sac Outlet
  Putrid Goblin and Redcap both have undying, but the -1/-1 counters are canceled out by the +1/+1 counters on Metallic Mimic and Grumgully. That means that when either of the persisting Goblins die, they will return without the -1/-1 counters. Persist's rules text are as follows: "When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it." That means since the creatures have no -1/-1 counters on them when they re-enter the battlefield, they can die and re-enter the battlefield infinitely.

• Food Chain Combo
  Squee, the Immortal + Food Chain
  So long as you have both cards out, you have infinite mana. With food chain, you can exile a creature you control to grant yourself as much mana as is in its CMC plus one, and you can cast Squee from your graveyard or from exile. So you exile Squee, cast Squee, and repeat the cycle for infinite mana.

• Kiki-jiki, Mirror Breaker + Conspicuous Snoop

  Conspicuous Snoop + Boggart Harbinger/Goblin Recruiter + Kiki-Jiki, Mirror Breaker: infinite Kiki-Snoops until EOT
  If you have Conspicuous Snoop out, cast Boggart Harbinger/Goblin Recruiter. When Harbinger/Recruiter enters the battlefield, you can put Kiki-Jiki on top of your library. Conspicuous Snoop has the activated abilities of any Goblin on the top of your library, so you can create a copy of Conspicuous Snoop with your Conspicuous Snoop, Mirror Breaker. You can do this indefinitely. Then, you can create a copy of Boggart Harbinger with your last Kiki-Snoop. When you do, you can top Sling-Gang Lieutenant to sacrifice the billions of Conspicuous Jikis.

  • Sac outlet (Goblin Bombardment, Sling-Gang Lieutenant, Pashalik Mons (only EOT) --> infinite Ping) or (Skirk Prospector --> infinite red Mana) + Korvold (infinite card draw)
  • Krenko, Mob Boss (infinite Goblin-Tokens) + Haste from Goblin Warchief or Goblin Chieftain --> Combat Kill
  • Goblin Sharpshooter (infiinte damage EOT, because the Kiki-Snoops die EOT)

• Kiki-jiki, Mirror Breaker + Boggart Mob
  Cast Boggart Mob and champion Kiki-Jiki, Respond to Boggart Mob's ability by tapping Kiki-Jiki to create a copy of Boggart Mob. Kiki-Jiki will be exiled. With the copy's ability, champion the original Boggart Mob, Kiki-Jiki will return to the battlefield. Sacrifice the copy with Goblin Bombardment or Sling-Gang Lieutenant (Goblin Sharpshooter or Pashalik Mons both kill eot) to deal 1 damage to the opponent.
  The original Boggart Mob will return to the battlefield. Repeat the process.

Note, if you have Food Chain on the field the Kiki-Jiki combos also allow you to get infinite mana