The fundamentals look solid once prices stabilize
When you do, gain control of target creature that player controls with power less than or equal to the tapped creature's power for as long as you control Nihiloor
The original trio of Eldrazi titans all had an anti-reanimator clause that shuffles your graveyard away, but this can actually be used as an edge against dedicated mill decks and graveyard hate
Discard 1 card, and if you do, Special Summon 1 Level 1 "Purrely" monster from your Deck
Vraska's Contempt: The lifegain is insignificant compared to the exile effect, which is well-costed, Also, instant speed is awesome
The average spellslinger deck should be able to get the disguise cost down to a single mana, making this the latest in a long line of similar creatures like Hearth Elemental and Bedlam Reveller