Once tied directly to the investigate keyword, since Avatar WotC has decided they can be their own thing, and just use investigate when the mystery/detective vibes fit the particular set
Just follow these easy steps: Give Taigam evasion with cards like Distortion Strike and Taigam's Strike so he can attack safely
If another effect (or effects) modifies how much damage a source would deal to the chosen player or a permanent they control (for example, by preventing some of that damage), the player being dealt damage or the controller of the permanent being dealt damage chooses the order in which any such effects, including the effect of Sawhorn Nemesis, apply
Its cheap and you get the full value of whatever creatures you copy
Its really, really good in Control decks, as it buys a lot of time and life total, slowing the game down a little
Ultimately, the team agreed that phasing could still have a positive role to play, so long as the players had more control over when things phased out