Combo ETB:
ETB: Purphoros, God of the Forge / Impact Tremors

Grinning Ignus + Runaway Steam-Kin
Grinning Ignus + Birgi, God of Storytelling
Dualcaster Mage + Twinflame
Dualcaster Mage + Heat Shimmer
Kiki-Jiki, Mirror Breaker + Lightning Crafter
Cloudstone Curio + Dockside Extortionist

Combo working with sac:
SAC: Ashnod's Altar / Goblin Bombardment /Skirk Prospector

Kiki-Jiki, Mirror Breaker + Lightning Crafter
Kiki-Jiki and Skirk Prospector on the battlefield.
Cast Lightning Crafter, targeting Kiki-Jiki with the champion trigger.
With the champion trigger on the stack, target Lightning Crafter with Kiki-Jiki's ability, creating a token copy with haste.
Target Kiki-Jiki with the token's champion trigger.
Resolve the token's champion trigger, exiling Kiki-Jiki.
(Tap the token to deal 3 damage to a target of your choice.)
Sacrifice the token -> [DoSAC] and returning Kiki-Jiki to the battlefield untapped.


Combo Goblin Recruiter:
Goblin Recruiter + Conspicuous Snoop + Kiki-Jiki, Mirror Breaker + Mogg Fanatic + Torch Courier

Goblin Recruiter in hand.
Cast Goblin Recruiter.
Search your library for Conspicuous Snoop, Torch Courier, Kiki-Jiki, and Mogg Fanatic, and put them on top of your library in that order.
Draw a card.
Cast Conspicuous Snoop. Cast Torch Courier from the top of your library.
Activate Torch Courier by sacrificing it, giving Conspicuous Snoop haste.
Activate Conspicuous Snoop using the ability gained due to Kiki being on the top of your library by tapping Conspicuous Snoop, creating a token copy of itself.
Repeat step 7 for infinite tapped token copies of Conspicuous Snoop.
Activate your untapped token copy to Conspicuous Snoop by tapping it, creating a copy of Goblin Recruiter.
Goblin Recruiter enters the battlefield, searching your library for Mogg Fanatic and putting it on top of your library.
Sacrifice an arbitrarily large number of Conspicuous Snoop tokens using the ability gained due to Mogg Fanatic being on top of your library for damage.