mtg commander 2021 cards Promise of Loyalty (Extended Art) [Commander 2021] Whenever one or more artifact creatures enter the battlefield under your control Commander 2021's New Legends -

Activate his +1 before combat so you can discard a creature card, then swing in with your Writ of Return ciphered creature to bring it back to the battlefield makes for a nice line of play too

If Aang's Iceberg leaves the battlefield before the activated ability resolves, you will be unable to sacrifice Aang's Iceberg and will not scry, even if Aang's Iceberg was sacrificed via a different ability while its activated ability was on the stack

Shoot, you can even Reality Shift your own stuff, especially if you know what's on top of your library (via Soothsaying or some such)

Docent of Perfection, Sedgemoor Witch, and Talrand, Sky Summoner are classics that can serve as your blockers and threats

Its a tricky list to pin down in terms of archetype, but Heisen01 identified it as Golgari Garden in a post on X, so well go with that