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Mowu, Loyal Companion is a fantastic Dog in this deck, since Sophias activated ability will grow Mowu quickly, making Mowus vigilance and trample abilities better and better

One of the cards I absolutely adore, which definitely fits the 'cute' bill, is the Pikachu from the Legendary Treasures set

Only Summons by game mechanics (Normal, Flip, and Pendulum Summons, as well as Extra Deck Summons other than Fusion Summon) and Summons by Summoning procedures (including both those of Normal Summon Monsters and Special Summon Monsters) can be negated, and only when they occur outside of a Chain

Though I suppose Spirit Mascots two colors might make it harder to cast