Marill would have been under $10, and its now more than $33
Dancing Shuriken is dependent on your luck with coin flips
Mono U could likely support a rare mill deck (Ruin Crab, Maddening Cacophony, Field Research, Glacial Grasp, blockers like Skyclave Squid to fill the curve, etc), though most Mono-Blue inclined decks will likely just end up UB
But unfortunately, we still have to discuss it when the need arises, especially considering the card was so powerful it was banned in Modern and it's still seeing play in Legacy
Recipe Duel To unlock recipe duel so you can play against a computer controlled version of any of your decks: Unlockable CPU Opponents Fulfill the following conditions to unlock CPU opponents
Mana cost includes color.) Fear At the beginning of your endstep, exile a card from each opponent's hand