You need to strike a balance with Heroic decks - both the right amount of creatures and a reliable number of spells to target them with. The thing is, while creatures stick around, spells are generally one-and-done. So how do we ensure a steady stream of targeted spells to let Heroic do its thing?
White probably has the most impressive aggressive creatures, in the package of Favored Hoplite, Phalanx Leader and Akroan Skyguard. Blue has some good support options, with Triton Fortune Hunter to fill your hand and Sage of Hours as a zany backup trick. We have our colours, now we need the spells to round things out.
View from Above is the perfect fit for , being two mana to target a creature, then since we're running sixteen white creatures (and two enchantments!) probably pop right back into the hand. Cast it again, piling up counters thanks to Phalanx Leader or just making your whole army fly over your opponent's blockers. Who needs buyback when your spells come back for free!
Another cheap multi-use spell is the underrated Hidden Strings. It has a million uses - untap your lands to play another card, tap down blockers to ensure you get that subsequent hit in, or the obvious, untap two of your guys to trigger their Heroic boosts. Combine the Strings with View From Above or a way to grant Protection and you should be able to slip past enemy blockers, getting another two Heroic triggers for free each turn!
Emerge Unscathed gives you two triggers for a single mana. The rebounded version will often be used to simply dodge blockers, but the first casting is best as a surprise answer to removal. Flickering Ward can protect a buffed-up creature from your enemy's cards or be bounced and replayed repeatedly for multiple triggers. Ordeal of Thassa will almost always go off the turn you play it, generally representing two cards and two +1/+1 counters for a measly two mana.
