instead, it exiles itself and returns to the battlefield front face up
Sounds like a hit to me
We've seen some other semi-popular Kamigawa cards like Oboro, Palace in the Clouds and Minamo, School at Water's Edge maintain huge prices despite fairly low play, which means if Shining Shoal does develop into an archetype staple in Modern, its price could climb even higher
There is a PSA 10 listed on TCGplayer (for some reason) for $2,000, but that price means nothing until a sale is recorded
This means if a player has a way to flicker a Sylvan Primordial, you quickly end up in a situation where they have all their lands out, and the rest of the table is stuck on zero mana
For zero cost, the player can exile a card to bring Chrome Mox onto the field