1 Rampage of the Valkyries
Torture Chamber, Thumbscrews, Wheel of Torture, The Rack, and those sorts of cards might make for an entertaining theme deck, but too few of them would have reliably contributed to what the deck wants to do
Anthem of Champions A simple card with huge appeal to anyone looking to get aggressive with creatures, Anthem of Champions costs just two mana, cheaper than the iconic Glorious Anthem which came before it
The next best thing you can do is just jam them all into the same deck
Midrange - Use the best available mid-cost cards to outmaneuver both aggro and control
Having access to a card that can snipe a pesky enchantment, remove a creature (as long as you do the usually-trivial extra work of having a creature in play), or draw cards when neither of the other modes are relevant, means this spell is never going to rot in your hand