The first activated ability you activate during your turn that targets a creature you control costs less to activate.
Whenever one or more creatures you control become the target of an activated ability, draw a card. This ability triggers only once each turn.
Professor Hojo turns your activated abilities into card advantage engines: every turn the first ability targeting one of your creatures costs less, and you draw a card the first time any of your creatures gets targeted by an activated ability. You ramp out a board of value creatures, then lean on repeatable abilities (equip, pump, counters, regrowth-on-a-stick) to draw cards and snowball into a dominant green midrange or +1/+1 counter board.
Free card every turn once you have an activatable target, fighting mono-green's chronic card-draw problem
Cost reduction makes expensive equip/pump abilities far more castable, accelerating your engine
Only two mana, so he comes down early and rebuilds quickly after removal
Slots into many green shells (counters, equipment, fight) without demanding a niche package
Both abilities are capped at once per turn, so you can't loop a single activation for infinite value
Needs creatures on board plus an ability source; a clean board wipe shuts the engine off
No built-in evasion or protection, so he and your team are vulnerable to spot removal
Mono-green offers limited interaction, leaving you weak to combo and control decks
Cheap protection to keep your board and engine alive through wraths and targeted removal.
Add stronger discounted activated-ability engines (Ozzie counters payoffs, repeatable fight outlets, cheap equipment) and lean into the per-turn draw with ramp like Sol Ring, Cultivate, and mana dorks to deploy multiple threats. Improve protection with Heroic Intervention, Snakeskin Veil, and Lightning Greaves, and round out with a tutorable finisher such as Craterhoof Behemoth or Triumph of the Hordes to convert your board into a kill.
Legendary Creature — Human Scientist
less to activate.