Made from trout scales and crawfish whiskers, merrows' shimmering banners flash in the water like lightning.

Stonybrook Banneret

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Merfolk spells and Wizard spells you cast cost {1} less to cast.

The Lost Caverns of Ixalan Commander

The List

Morningtide

Islandwalk
Merfolk spells and Wizard spells you play cost {1} less to play.

A spell you cast that's both creature types costs {1} less to cast, not {2} less.

The effect reduces the total cost of the spell, regardless of whether you chose to pay additional or alternative costs. For example, if you cast a Rogue spell by paying its prowl cost, Frogtosser Banneret causes that spell to cost {1} less.