Arena (Book Promo) [HarperPrism Book Promos] Dog that player chooses one of

that player chooses one of their opponents

Set: Weatherlight Type: Land Rarity: Uncommon Gemstone Mine enters the battlefield with three mining counters on it

Whenever Thief of Sanity deals combat damage to a player

copy this spell except for its epic ability

{T}: Add {C} for each charge counter on Everflowing Chalice

Arena (Book Promo) [HarperPrism Book Promos] Dog that player chooses one ofSet: HarperPrism Book Promos Type: Land Rarity: Rare {3}, {T}: Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)