Defender (This creature can't attack.)
Whenever you
surveil (Look at the top cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.), put a +1/+1 counter on Thoughtbound Phantasm.
As long as Thoughtbound Phantasm has three or more +1/+1 counters on it, it can attack as though it didn't have
defender (This creature can't attack.).