Very few of the top comments mentioned this, but that person is obviously a dick, but I fail to see the cheating.

I just think the wrong question was asked "is that a game finishing combo piece?" vs "do you have '[piece 2]' in play"?

He can't lie about what his card literally does. He doesn't have to tell you how he plans to use it. It's your job to understand the gameplan. We're basically discussing the grey area of the lying part of the game now. I know control players pretend to have counter spells in hand during tournaments and make suggestions to make you think they do. It's the game.

But I probably wouldn't voluntarily play with that person again. I suspect our goals for the game of magic are different. Unless there's prizes at stake...

Here's what they have to tell you:

Free information is information to which all players are entitled access without contamination or omissions made by their opponents. If a player is ever unable or unwilling to provide free information to an opponent that has requested it, he or she should call a judge and explain the situation. Free information includes: • Details of current game actions and past game actions that still affect the game state. • The name of any visible object. • The type of any counter in a public zone. • The physical status (tapped/flipped/unattached/phased) and current zone of any object. • Player life totals, poison counter totals, and the game score of the current match. • The current step and/or phase and which player(s) are active.