Silvergill Mentor {1}{U}
Creature — Merfolk Wizard
As an additional cost to cast this spell, behold a Merfolk or pay {2}. (To behold a Merfolk, choose a Merfolk you control or reveal a Merfolk card from your hand.)
When this creature enters, create a 1/1 white and blue Merfolk creature token.
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Cards that do something similar expected a card that isn't here?
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Merrow Skyswimmer 100%
$0.18#21234
"When this creature enters, create a 1/1 white and blue Merfolk creature token."
Silvergill Adept 90%
$0.19#12506
"As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}."