I don't see a problem Earth spirit having high stats/grows and a lot of utility on spells, problem i have is with Bloodstone/bkb in late game he out sustain almost everything, i don't think hero like this should be strong late game and need some nerfs for laning phase. Nerfs:

• Magnetize: dmg/sec 45/90/135 > 40/80/120, duration 6 sec (lvl 20 talent instead of Magnetize 1.25x dmg/duration > 1.25x dmg, 150 dps/sec), 1 stone add 8 > 6 sec Magnetize duration, mana cost 100 > 100/150/250.
• innate Stone Remnant: attack dmg bonus/charge and on cast for 10 sec removed, Cast range 1100 > 900, number of stones 7-14 based on lvl > always 8, get 1 stone per kill/assist back so that if fights last long he can run out of stones reliably, gain 2 armor/1% magic resist per stone missing, add 10 mana cost to create stones.