Stealing an opposing phase is awesome
One thing Ill mention is not to overlook playing your commander with only one or two creatures if you know you can play more and flicker it again

Facilier, Savvy Opportunist Common 39 Elsa, Gloves Off Common 40 Fairy Godmother, Here to Help Uncommon 41 Fairy Godmother, Mystic Armorer Legendary 42 Fairy Godmother, Pure Heart Common 43 Heihei, Persistent Presence Uncommon 44 Jiminy Cricket, Pinocchios Conscience Common 45 Kuzco, Wanted Llama Common 46 Madam Mim, Fox Rare 47 Madam Mim, Purple Dragon Legendary 48 Madam Mim, Rival of Merlin Rare 49 Madam Mim, Snake Uncommon 50 Merlin, Crab Common 51 Merlin, Goat Uncommon 52 Merlin, Rabbit Rare 53 Merlin, Shapeshifter Rare 54 Merlin, Squirrel Common 55 Peter Pans Shadow, Not Sewn On Super Rare 56 Pinocchio, Star Attraction Rare 57 Pinocchio, On the Run Uncommon 58 Pinocchio, Talkative Puppet Uncommon 59 Winnie the Pooh, Hunny Wizard Common 60 Yzma, Scary Beyond All Reason Super Rare 61 Yzma, Without Beauty Sleep Uncommon 62 Gruesome and Grim Rare 63 Im Stuck Common 64 Legend of the Sword in the Stone Common 65 Binding Contract Uncommon 66 Croquet Mallet Common 67 Perplexing Signposts Rare 68 The Sorcerers Spellbook Rare 69 Arthur, Trained Swordsman Common 70 Beast, Relentless Legendary 71 Belle, Bookworm Uncommon 72 Belle, Hidden Archer Legendary 73 Bucky, Squirrel Squeak Tutor Uncommon 74 Cheshire Cat, Always Grinning Uncommon 75 Cheshire Cat, From the Shadows Super Rare 76 Daisy Duck, Secret Agent Uncommon 77 Donald Duck, Perfect Gentleman Uncommon 78 Donald Duck, Sleep Walker Common 79 Dr

As a commander by itself, Blue wants to play cards like Slippery BogbonderSlippery Bogbonder, Agent's ToolkitAgent's Toolkit, and all the other cards that you would find in a typical +1/+1 counter deck, as having all of your Dinosaurs come in bigger is never a bad thing
Derevi, Empyrial Tactician, Hinata, Dawn-Crowned, and Thassa, Deep-Dwelling are a few popular commanders to pair with Willbreaker
Only tournament judges received these cards, which means they were not available in starter packs or booster, leading to a lower supply