Having doubles isnt necessarily a bad thing, though you have to be keenly aware of permanents on your battlefield and cards in your graveyard, otherwise you wont get a Treasure from Sisay. No one wants to wait in line, only to find out that the Meet and Greet hours have ended before you could say hi to your favorite Magic character
Unfortunately, this privilege will not be available for all

Sort Card Type Lumineon #11Holo Rare $7.36 Lumineon #4Holo Rare $4.82 Lumineon #19Uncommon $0.48 Lumineon #40Uncommon $0.21 Lumineon #41Uncommon $0.04 Lumineon #36Uncommon $0.06 Lumineon #21Uncommon $0.08 Lumineon #28Uncommon $0.13 Lumineon #14Common $0.29 Lumineon #19Uncommon Lumineon V #40Ultra Rare $0.81 Lumineon V #40Ultra Rare $2.47 Lumineon V #GG39Ultra Rare $24.19 Lumineon V - 026/172 #26Double Rare $0.41 Lumineon V - 030/100 #30Double Rare $0.58 Lumineon V - 104/100 #104Super Rare $4.52 Lumineon V - 105/100 #105Super Rare $17.07 Lumineon V - 2022 (Ondrej Skubal) #40Ultra Rare $0.88 Lumineon V - 2023 (Gabriel Fernandez) #40Ultra Rare $0.71 Lumineon V - 2023 (Tord Reklev) #40Ultra Rare $2.55 Lumineon V - 2024 (Jesse Parker) #40Ultra Rare $0.90 Lumineon V - 216/172 #216Special Art Rare $22.18 Lumineon V - SWSH250 #SWSH250Promo $0.71 Lumineon V (Alternate Full Art) #156Ultra Rare $14.86 Lumineon V (Full Art) #155Ultra Rare $2.89 Lumineon V #GG39Ultra Rare $24.19 Lumineon V - 216/172 #216Special Art Rare $22.18 Lumineon V - 105/100 #105Super Rare $17.07 Lumineon V (Alternate Full Art) #156Ultra Rare $14.86 Lumineon #11Holo Rare $7.36 Lumineon #4Holo Rare $4.82 Lumineon V - 104/100 #104Super Rare $4.52 Lumineon V (Full Art) #155Ultra Rare $2.89 Lumineon V - 2023 (Tord Reklev) #40Ultra Rare $2.55 Lumineon V #40Ultra Rare $2.47

But something with the color identity Black and White does not count
And its a repeatable effect
Creature Ertai Resurrected Flash When Ertai Resurrected enters, choose up to one Counter target spell, activated ability, or triggered ability