Devoted Druid + Twinning Staff + Ivy, Gleeful Spellthief + Lion Umbra + Retraction Helix

Prerequisites

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Steps

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

Effects

• Infinite power and toughness for certain creatures
• Infinite storm count