Pre-War Formalwear + Leonin Relic-Warder + Umbral Collar Zealot

Decks

How it works

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Cast Leonin Relic-Warder by paying .
When Leonin Relic-Warder enters the battlefield, its first ability triggers, exiling Pre-War Formalwear.
Activate Umbral Collar Zealot by sacrificing Leonin Relic-Warder.
When Leonin Relic-Warder dies, its second ability triggers, returning Pre-War Formalwear from exile to the battlefield.
When Pre-War Formalwear enters the battlefield, it triggers, returning Leonin Relic-Warder from your graveyard to the battlefield, and attaching Pre-War Formalwear to it.
When Leonin Relic-Warder enters the battlefield, its first ability triggers, exiling Pre-War Formalwear.
Resolve the Umbral Collar Zealot ability from step 3.
Repeat from step 3.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.