Stangg, Echo Warrior

Whenever Stangg attacks, create Stangg Twin, a legendary 3/4 red and green Human Warrior creature token. It enters tapped and attacking. For each Aura and Equipment attached to Stangg, create a token that's a copy of it attached to Stangg Twin. Sacrifice all tokens created this way at the beginning of the next end step.

Dominaria United Commander

Whenever Stangg, Echo Warrior attacks, create Stangg Twin, a legendary 3/4 red and green Human Warrior creature token. It enters the battlefield tapped and attacking. For each Aura and Equipment attached to Stangg, create a token that's a copy of it attached to Stangg Twin. Sacrifice all tokens created this way at the beginning of the next end step.

If a replacement effect causes the created tokens to have different characteristics or causes additional tokens to be created this way, those tokens will still be sacrificed at the beginning of the next end step.

If another player gains control of the tokens created this way, the ability that causes you to sacrifice them will still trigger. However, any tokens you no longer control can't be sacrificed and will remain on the battlefield.

If, for any reason, an Aura token that would be created this way can't be attached to Stangg Twin, that token isn't created. If an Equipment token that can't be attached to Stangg Twin would be created, that token enters the battlefield unattached.