This would have been done by carrying over a few popular cards, adding many new ones and featuring a different back design to differentiate subsequent sets

POWERFUL RIGHT OUT OF THE BOXBattle your friends with powerful creatures and spectacular spells with a 100-card Commander Deck thats ready to defeat your opponents right out of the box SOW THE SEEDS OF DEVASTATIONRamp up with Lands, then send your mightiest monsters out swinging with this deadly Green-Blue deck INTRODUCES 15 COMMANDER CARDSThis deck introduces 15 never-before-seen Commander cards to Magic: The Gathering, including 2 foil Legendary Creature cards COLLECT SPECIAL TREATMENT CARDSEach deck also comes with a 2-card Collector Booster Sample Pack containing 2 alt-border cards from the Modern Horizons 3 set, including 1 Rare or Mythic Rare and at least 1 Traditional Foil card YOUR NEW FOREVER FAVORITESIntroducing a heaping helping of exciting cards plus the return of competitive favorites, theres something for everyone to love in Modern Horizons 3 Commander Decks For Fun I normally have a slam dunk pick for this category, but these decks waffled around too much

Merlin was never a frog in the movie, but apparently, there are unused character designs with him as a frog and a dog, plus Mim as a stork
(The token is an artifact with ": Add
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If you love casting Dragons and attacking with evasive creatures, then Tiamat is a great choice of commander