Lonis, Genetics Expert | Krark-Clan Ironworks | Helm of the Host

Cards

At the beginning of your combat phase,
Helm of the Host triggers, creating a nonlegendary token copy of
Lonis.
Activate
Krark-Clan Ironworks by sacrificing a Clue, adding ({C} magic symbol) ({C} magic symbol) .
Lonis and the
Lonis token's second abilities trigger.
Resolve the nontoken
Lonis trigger, putting a +1/+1 counter on the token
Lonis.
The token
Lonis's first ability triggers, creating a Clue artifact token.
Resolve the token
Lonis's trigger from step 2, putting a +1/+1 counter on the nontoken
Lonis.
The nontoken
Lonis's first ability triggers, creating a Clue artifact token.
Repeat from step 2.

You may optionally target any other creature using one of the triggers to put infinite +1/+1 counters on that creature.
Once you have infinite mana, you may instead sacrifice the Clues to their own abilities.