Jace, The Constructor

Hexproof
At the beginning of your upkeep draw a card for
each loyalty counter on Jace, The Constructor then you may discard a card and put a loyalty counter on Jace, The Constructor
As long as Jace, The Constructor has three or more loyalty counters you and permanents you control
have Hexproof and spells you cast can't be countered
{3}{u}{u}{u}: transform Jace, The Constructor