Devoted Druid + Twinning Staff + Ivy, Gleeful Spellthief + Strong Back + Retraction Helix

Devoted Druid

Twinning Staff

Ivy, Gleeful Spellthief

Strong Back

Retraction Helix

How it works

1. Cast Retraction Helix by paying , targeting Devoted Druid.
2. Ivy triggers. Choose not to copy Retraction Helix
3. Resolve Retraction Helix
4. Cast Strong Back by paying 2, targeting Devoted Druid.
5. Ivy triggers, copying Strong Back twice due to Twinning Staff. Choose to have one copy target Ivy and the other copy target Devoted Druid.
6. Resolve all three Strong Backs, attaching one to Ivy and two to Devoted Druid.
7. Activate Devoted Druid using the ability given to it by Retraction Helix by tapping it, returning the nontoken Strong Back from the battlefield to your hand.
8. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
9. Activate Devoted Druid's first ability by tapping it, adding .
10. Repeat steps 8 and 9 two additional times, then repeat step 8 one additional time.
11. Repeat from step 4.