Messages

When collected company is played, what happens if an X cast creature is drawn such as Endless One. Could he come in as a 3/3 or could you just not cast him?

I was playing a game with a friend and I played Dragonlord Silumgar and tried to take control of his Icefall Regent. He argued that I had to pay two extra colorless mana to target the Icefall that I didn't have. I said that I don't because the taking control is an ability and not a spell. I was wondering if anyone could clear this up for us.