They don't share any abilities with the other creatures in the band (so banding a creature with flying with a creature without flying doesn't give the other creature flying), but if one creature is a band is blocked, the entire band is blocked
Warhammer 40,000 Commander (40K) 617 cards Released 2022-10-07 $3,138.28 703.63 518.48 TIX Surge Foil Commanders 8 cards Foil Commanders 8 cards Surge Foil Display Commanders 4 cards Display Commanders 4 cards Promos 1 card New Cards 160 cards Reprints 136 cards Collector's Edition Surge Foils 296 cards Their mind whirled with grand plans, never thinking of what might happen if they got to the end of the list
Which is proven by the fact that Ascended Heroes set featured another card with 380 HP: Mega Emboar ex, as you can see above
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Arvinox, the Mind Flail: For the purposes of deck construction, format legality, and all rules, abilities, and effects that refer to a cards name, this cards name is the same as that of Mind Flayer, the Shadow
