Archelos, Lagoon Mystic + Gretchen Titchwillow + Training Grounds + Simic Growth Chamber

Archelos, Lagoon Mystic

Gretchen Titchwillow

Training Grounds

Simic Growth Chamber

How it works

1. Play Simic Growth Chamber.
2. Simic Growth Chamber enters the battlefield untapped due to Archelos, triggering itself.
3. Holding priority, activate Simic Growth Chamber by tapping it, adding .
4. Resolve the Simic Growth Chamber trigger from step 2, returning itself to your hand from the battlefield.
5. Activate Gretchen Titchwillow by paying , causing you to draw a card and put Simic Growth Chamber from your hand onto the battlefield.
6. Repeat from step 2.