As a mythic, Wrenn and Realmbreaker will only continue to go up in value if it sees more competitive play since its availability is more limited
TCGplayer takes care of payments, deducting around 1213% in total fees (covering platform and payment processing), and sends the rest to your bank or PayPal once you confirm shipment
The value of an MTG card can depend on a variety of factors, such as its rarity, age, and power level within the game
In those early years, eBay was helpful but not yet a major driver of growth
A player can take mulligans until their opening hand would be zero cards. Wed generally recommend against going down to zero cards, but were not the boss of you, so youre more than welcome to go for it if its something you want to try out