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You can activate boast at any time during your turn after attacking with a boast creature, including in the declare attackers step before blocks

The benefits of shaving your opponents life down are twofold as this also triggers proliferation meaning you get to double any existing counters on your creatures

Set Number 19 Language Franais Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (9/20/2024) Demonic Covenant's first ability will trigger once for each player you attack with one or more Demons

Chaos Orb is the perfect way to test that, asking you to flip it over the table from a minimum height

Even Indestructible has issues at volume, since it disables so many aspects of combat and interaction