Osiris, Banished Truthseeker

Unsavory truths — Whenever Osiris becomes the target of a spell or ability he phases out.
Master of The Infinite Forest — As long as Osiris is phased out permanents you control have hexproof and instant and sorcery spells you cast cost {1} less to cast.
Fragile Elder — Osiris must be targeted by all spells and abilities.