Dragonlord Silumgar and Icefall Regent

[KillerMartian]

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.

[imFourth of Phils]

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.

you are right, its an ability