These are the only Iconic cards in the set and have a unique foiling treatment
You can cleave it as an alternate cost, and then you net a free spell for the turn, and I love it on an enemy's turn when you cast this for free, to bounce what your foe played and then drop a flash thing like Hullbreaker Horror or Ancient Stone Idol or you can just cast another instant that draws you cards
For Riders of Rohan, this might involve leveraging the Monarch mechanic to draw extra cards and deploying Human tokens to build a formidable army
So that means triggering your Hedron Crab also triggers this homarid mercenary, as would targeting them with something like Glimpse the Unthinkable
(Tales of Middle-earth was legal in the Modern format, but not Standard.) The Final Fantasy set is a big deal for Magic because it brings Universes Beyond into Standard, helping to usher in Spider-Man and Avatar: The Last Airbender sets later this year that will also be Standard-legal