Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If you control a Merfolk, draw a card.

Tap an untapped Merfolk you control: Target player mills a card.

Whenever a Merfolk you control becomes tapped, you may gain 1 life.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

When Merrow Harbinger enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.

As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay .

When Silvergill Adept enters, draw a card.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Merfolk spells and Wizard spells you cast cost less to cast.

: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)

: Target land becomes an Island until end of turn.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

: Target Merfolk you control gains protection from the color of your choice until end of turn.

Champion a Merfolk (When this enters, sacrifice it unless you exile another Merfolk you control. When this leaves the battlefield, that card returns to the battlefield.)

Whenever Wanderwine Prophets deals combat damage to a player, you may sacrifice a Merfolk. If you do, take an extra turn after this one.