Arcbound Crusher + Staff of Eden, Vault's Key Combos

Combo 1 with Moritte of the Frost

Steps

1. Cast Moritte of the Frost from your hand or from the command zone by paying {2}{G}{U}{U} plus commander tax, if applicable, choosing to have it enter the battlefield as a copy of Staff of Eden.
2. Put Moritte of the Frost into your graveyard due to the legend rule.
3. Morrite of the Frost's enters-the-battlefield ability and Arcbound Crusher trigger.
4. Resolve the Arcbound Crusher trigger, putting a +1/+1 counter on it.
5. Resolve the Moritte of the Frost trigger, returning Moritte of the Frost from your graveyard to the battlefield as a copy of Staff of Eden.
6. Repeat from step 2.