Heartstone can reduce the cost of its activated ability so you can use Trostani multiple times a turn
The first will force the targeted foe to draw three and discard three at random (good for discard punishing decks like Megrim), sacrifices a non-token artifact (not a Treasure, Clue, Blood, or Food), and the Balor shoots them for the damage to the cards in their hand (nice)
Swords to Plowshares is a one-mana white instant that lets you exile a creature, and then its controller gains life equal to that creature's power
On top of potentially improving existing synergies, Squandered Resources can also create a few infinite combos
We finish with the unusual uncommon in my top spot
That high Willpower gives him a certain freedom to Quest too, as he can soak up a decent amount of damage when Challenged