Rukarumel on the battlefield with "Sliver" chosen.
Steps
Cast
Crimson Kobolds by paying ({0} magic symbol) , and choosing to pay its replicate cost an arbitrarily large number of times by paying ({0} magic symbol) .
Crimson Kobolds triggers, creating a copy of it for each time its replicate cost was paid.
Resolve all
Crimson Kobolds spells, causing the nontoken
Crimson Kobolds to enter the battlefield, and creating a token copy of it for each time its replicate cost was paid.
Results
Infinite ETB.
Infinite creature tokens.
Metadata
In 11 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).