Not only do they send cards to the graveyard, which synergizes exceptionally well with reanimation strategies or mechanics like delve, but they also have basic land types, making them fetchable with lands like Scalding Tarn
it's a one-time trigger when he's played, not a repeatable effect you activate turn after turn
Storm the Seedcore features an unlikely group of Mirran warriors charging in unison with one common goals getting the dryad Wrenn to the Realmbreaker tree in order to stop the Phyrexians from accessing and invading other planes
Incarnations with play abilities
The combination of mana production, pressure, lifegain, and graveyard hate makes this elf shaman wildly versatile
Profts Eidetic Memory I really want to put Proft's Eidetic Memory higher, but its just relatively low impact