Delvefall
Silvergill Mentor

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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extra filters

color identity, fits-within like deckbuilding: tick W and U and only white, blue, white-blue and colorless cards show. in the filter box: id:wu (or -id:rg to ban colors), or id:c for colorless only

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price bounds, in the currency picked below. cards with no listed price are hidden by any price filter. in the filter box: usd<=5, eur>=1

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mana value bounds (converted mana cost). in the filter box: mv<=2, cmc>=4, both spellings work

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only legendary creatures, the cards that can lead a commander deck

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Cards that do something similar expected a card that isn't here?

Merrow Skyswimmer
Merrow Skyswimmer 100%
$0.18#21234
"When this creature enters, create a 1/1 white and blue Merfolk creature token."
Silvergill Adept
Silvergill Adept 90%
$0.19#12506
"As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}."
Emperor Mihail II
Emperor Mihail II 86%
$0.35#4185
"Whenever you cast a Merfolk spell, you may pay {1}. If you do, create a 1/1 blue Merfolk creature token."