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Merfolk Cavediver - 2U
Creature - Merfolk Scout (U)
Whenever a creature you control explores, Merfolk Cavediver gets +1/+0 until end of turn and can't be blocked this turn.
"Learn all you can of these underground waters. I suspect many more of our ancestors' secrets await us within these depths." -Tishana
2/4
Translation via MTG Goldfish
YOU BEEN DOWN TOO LONG IN THE MIDNIGHT SEA
We'll see how the stats line up, but this looks like a top three common for blue to me. I could see it stonewalling aggro and then providing inevitable damage late