Youll need to exert the Combat Celebrants one at a time, in multiple combat phases, to untap your attacking creatures and attack with them in each combat step
Like always, if there are any cards that you are interested in as a commander, make sure to let me know and I will see what I can do
Aatchik, Emerald Radian Amzu, Swarm's Hunger Ant Queen Ant-Man, Colony Commander Beacon of Creation Canoptek Scarab Swarm Crawling Infestation Crawling Sensation Deadly Grub Dragonlair Spider Eumidian Hatchery Fumulus, the Infestation Giant Caterpillar Grist, the Hunger Tide Grist, the Plague Swarm Hiveheart Shaman Hornet Cannon Infestation Expert Infestation Sage Infested Roothold Iridescent Hornbeetle Izoni, Thousand-Eyed Lord Dregg, Insect Invader Megaflora Jungle Old Rutstein One Dozen Eyes Phyrexian Swarmlord Scouring Swarm Scute Swarm Springheart Nantuko Swarm Shambler The Hive The Hunger Tide Rises The Locust God Trigon of Infestation Vilespawn Spider Vitality Charm Wirefly Hive Wirewood Hivemaster Xira, the Golden Sting
Olivias whenever one or more wording makes it tricky to maximize its potential, but note that this ability triggers for each player dealt combat damage, meaning in a typical Commander pod you can shoot for three extra Treasures each turn