Unicorn Cards - Primo uses a "Wisel" Deck, focused around his "Meklord Emperor Wisel". Primo's main method of Summoning it is through using "Wise Core", using cards such as "Spark Breaker", "Explosive
MERKLORD EMPEROR WISEL- PRIMO DECK[Yu-Gi-Oh! Duel Links]Easy Invocation - YouTube
Wisel | Yu-Gi-Oh! Wiki | Fandom
Wisel Mat Farm - 100 Summons in 5 Duels! : r/DuelLinks