Aang, the Last Airbender

Flying, first strike, vigilance
Aang gets +1/+1 for each Avatar you control.
{r}{g}{w}{u}: Aang gets +4/+4 and gains indestructible until end of turn. It gains the
Avatar subtype.
When Aang dies, if it was an Avatar, you may
search your library for an Avatar card and put it
on top of your library, then shuffle.