When cards you own on MTG Arena are banned, you get wildcards back of an equal rarity, which you can then spend on new cards
Sure, your Consecrated Sphinx is good to resolve, but before my turn, for the price of one blue mana and an expendable creature, let me get my own straight to the field with Mask of the Mimic as well
That said, theyre hoping to resell them for a profit, so you might not get maximum value this way
: Create a 2/1 white Cleric enchantment creature token
If you just bounced two Knight tokens and a Lyra Dawnbringer last turn, and then dropped Karn for free, the last thing theyre gonna want to see is Karns Temporal Sundering bouncing the Lyra again, and giving you two uncontested attacks without her around And thats to say nothing of having your own Lyra Dawnbringer when you Sundering