Planes usually have two important parts: A main ability which can be a continuous effect, such as Tazeem in Zendikar (whose ability is that creatures can't block while this plane is active), or a triggered ability, such as Undercity Reaches from Ravnica (which allows the controller to draw a card each time one of their creatures deals combat damage to a player)
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The flashback ability may not look like much, but it can be used later in the game when you have excess mana to increase the Storm count, generate a Treasure to trigger Revolt on Hidden Herbalists, or even just to sink some spare mana for the following turn