The creature card is already tapped and attacking as it's put onto the battlefield
(6/16/2023) Amass abilities are now written as "amass [subtype] N." Previous cards with amass have received errata to say "amass Zombies N." (6/16/2023) To amass Orcs N, if you don't control an Army creature, create a 0/0 black Orc Army creature token
They essentially negate all combat damage coming at you, althoughtrample can still be a problem
Basandra, Battle Seraph Basandra, Battle Seraph isnt a very good commander, but at least it has a cool ability
It's a 5/3 flier for 3BB, which lets it push lots of damage, and the player can discard a card to give Witch-King of Angmar indestructible to protect it from removal and combat damage
It's even better in casual today since we just adore using our graveyard with mill and more