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Since there is no limit to the number of times the trigger condition can be met, if you equip it with "Curiosity" or similar, you can continue to cast spells as long as your mana lasts

Card List: Avenger of Zendikar Birds of Paradise Beast Whisperer Beast Within Cultivate Eternal Witness Explore Farseek Fyndhorn Elves Garruk's Uprising Guardian Project Hardened Scales Harrow Heroic Intervention Kodama's Reach Llanowar Elves Nature's Lore Rampant Growth Return of the Wildspeaker Rishkar's Expertise Sakura-Tribe Elder Scute Swarm Three Visits Tireless Provisioner Wild Growth Sets and printings may vary across products

And, on the gamification side of the app, there is also a rewards system with which users can gain points (called "dragon dust") that can soon be redeemed for goodies

I know that several people have pointed out that Brainstorm plus a draw step equals four cards, but how often is someone casting Brainstorm on their own turn