Bailey, Vulpine Soulcaller

First strike, haste
Whenever a legendary creature you control attacks, create a colorless 0/1 Fox Spirit token
with haste and "{t}: Add {r}. Target legendary creature gets +1/+0 until end of turn."
Whenever you expend 7 on your turn, you
may put Bailey, Vulpine Caller onto the battlefield from the command zone.