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)
Three structural advantages drive this
Dreadhorde Arcanist Dreadhorde Arcanist might not look like much to the average player, but when you consider that older formats are full of incredibly cheap spells, suddenly it comes into focus
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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
