For 1 mana at instant speed, all your Islands tap for an additional mana
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Add in the fact that you get another creature whenever your opponent plays a spell on your turn, and you have the making for a pretty powerful (and fun) enchantment spell
Also, they have many targets on the bench that you can spread damage on, so mapping out your prize cards is important here
Just look at this How does one evaluate a card like this in a draft where you can also open Sol Ring, Swords to Plowshares, Flash, Ancestral Recall, The One Ring, Ragawan, Force of Will, Lightning Bolt and all the other very, very powerful cards that are in the Vintage Cube