Archmage Emeritus + Chain of Plasma + Brash Taunter

Steps

1. Cast Chain of Plasma targeting Brash Taunter by paying {1}{R}.
2. Archmage Emeritus triggers, drawing a card.
3. Resolve Chain of Plasma, dealing 3 damage to Brash Taunter, discarding a card, and copying Chain of Plasma with the same target.
4. Brash Taunter and Archmage Emeritus trigger.
5. Resolve Brash Taunter's trigger, dealing 3 damage to target opponent.
6. Resolve Archamage Emeritus's trigger, drawing a card.
7. Repeat from step 3.
8. Once you have one card remaining in library, decline to copy Chain of Plasma.