mtg cards that untap Very Cryptic Command (Untap) | Unstable Slumbering Cerberus - Creature -

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Board wipes like Austere Command, Cleansing Nova, Damnation, Toxic Deluge, Cyclonic Rift, Rivers Rebuke, Blasphemous Act, Vandalblast, and All is Dust are almost always worth having on hand in some capacity

The 9 mana value is staggering, so this archon has to be cheated onto the battlefield if you want to effectively use it

9 Fog Effects Named after the card Fog, fog effects are any card that prevents combat damage this turn

And, being an enchantment, Bastion of Remembrance is harder to interact with than creatures offering similar effects

So you can't Ghost Quarter it or make a Construct this main phase