Riftbound Flow
None of the 18 cards with Flow print a reminder explaining it, so there is no official wording to quote here. Rather than guess at the rule, the cards themselves are below.
Which domains get it
Which sets print it
Every card with Flow
Most expensive first. Prices are Cardmarket EUR.
Brittle Steel
Vendetta · 2 energy
no price yet
Death Mark
Vendetta · 2 energy
no price yet
Dragon Form
Vendetta · 3 energy
no price yet
Dredge Up
Vendetta · 2 energy
no price yet
Iterative Design
Vendetta · 4 energy
no price yet
Kennen - Storm of Shuriken
Vendetta · 3 energy
no price yet
Kennen - Storm of Shuriken
Vendetta · 3 energy
no price yet
Lacerate
Vendetta · 2 energy
no price yet
Lightning Rush
Vendetta · 1 energy
no price yet
Onslaught
Vendetta · 4 energy
no price yet
Perfect Execution
Vendetta · 3 energy
no price yet
Public Execution
Vendetta · 2 energy
no price yet
Shadow Dash
Vendetta · 2 energy
no price yet
Shuriken Flip
Vendetta · 1 energy
no price yet
Stargazer
Vendetta · 5 energy
no price yet
Twilight Shroud
Vendetta · 1 energy
no price yet
Twilight Step
Vendetta · 2 energy
no price yet
Up from the Deep
Vendetta · 3 energy
no price yet