Dr.Tron, Young Genius

Artifact spells you cast cost {2} or {u/r}{u/r} less. Dr.
Tron Young Genius has hexproof so long as you control three artifacts.
Whenever you draw a card, Dr.Tron Young
Genius deals 1 damage to any target.
Whenever a player casts an artifact, they counter
it unless they let you draw a card.