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.
Lightning Rush
Vendetta · 1 energy
EUR 18.40
Shuriken Flip
Vendetta · 1 energy
EUR 15.00
Kennen - Storm of Shuriken
Vendetta · 3 energy
EUR 11.99
Kennen - Storm of Shuriken
Vendetta · 3 energy
EUR 11.00
Death Mark
Vendetta · 2 energy
EUR 5.50
Public Execution
Vendetta · 2 energy
EUR 5.00
Shadow Dash
Vendetta · 2 energy
EUR 0.96
Twilight Step
Vendetta · 2 energy
EUR 0.16
Brittle Steel
Vendetta · 2 energy
EUR 0.13
Stargazer
Vendetta · 5 energy
EUR 0.11
Twilight Shroud
Vendetta · 1 energy
EUR 0.08
Onslaught
Vendetta · 4 energy
EUR 0.07
Up from the Deep
Vendetta · 3 energy
EUR 0.07
Dragon Form
Vendetta · 3 energy
EUR 0.06
Perfect Execution
Vendetta · 3 energy
EUR 0.06
Dredge Up
Vendetta · 2 energy
EUR 0.04
Lacerate
Vendetta · 2 energy
EUR 0.04
Iterative Design
Vendetta · 4 energy
EUR 0.02