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You may be so inclined to use a Tarmogoyf die, which only goes as high as 6/7
Distribution and quality of overall cards (ramp, interaction, draw): Theres enough colorfixing and ramp present here - its the actual speed of the deck Im more worried about
Legendary Status of Ho-Oh Ho-Oh has always been a top-tier legendary for collectorsjust think of how iconic it was as the cover Pokmon for Pokmon Gold
Often, cards are also banned when theyre only added to Arena for a specific Limited experience but arent intended to be factored into competitive play