Requires

Drafna, Founder of Lat-Nam must be on the battlefield. Intruder Alarm must be on the battlefield. Su-Chi must be in hand. Krark-Clan Ironworks must be on the battlefield. Drafna does not have summoning sickness. Mana needed:

Steps

1. Cast Su-Chi by paying .
2. Holding priority, activate Drafna's second ability by paying and tapping it, copying the Su-Chi spell.
3. Resolve the copy of the Su-Chi spell, creating a token copy of Su-Chi.
4. The token Su-Chi enters the battlefield, triggering Intruder Alarm, untapping all creatures.
5. Activate Krark-Clan Ironworks by sacrificing the Su-Chi token, adding .
6. The token Su-Chi dies, adding .
7. Repeat from step 2.
8. Once you have infinite mana, you may forego sacrificing the Su-Chi tokens.

Results