Excalibur the Cute

When Excalibur the Cute enters the battlefield, he is indestructible until the end of this turn. (Because look how Cute he is)
{3}{t} Excalibur The Cute screams at the target player until he pets him. As long as he doesn't
pet him, he's paralyzed.
If he pets him, Excalibur the Cute gets
a +1/+1 counter