Oketra the True

Double Strike, Indestructible
Oketra the True can't attack or block unless you control at least three other creatures.
{3}{w}: Create a 1/1 white Cat Warrior creature
token with Vigilance.
{3}{w}: Sacrifice Oketra the True, then return it to
play transformed. This ability takes only {w} to activate if another card would cause this creature
to leave the battlefield this turn.