Some questions posed to my by my MTG playing friends

[MiB1213]

I was showing this to SOME MTG players and they really enjoyed it. They had some questions regarding public knowledge.
(I don’t play MTG so I didn’t know that this was a thing)
1. They asked if you’re allowed to know how many cards you have in your hand and in your discard pile. Also is it legal to look through an opponents discard pile.
2. The ability on the Elf Theif “ zap to draw ...” can you zap it during an opponents turn.

[HunterS]

Originally Posted by MiB1213

I was showing this to SOME MTG players and they really enjoyed it. They had some questions regarding public knowledge.
(I don’t play MTG so I didn’t know that this was a thing)
1. They asked if you’re allowed to know how many cards you have in your hand and in your discard pile. Also is it legal to look through an opponents discard pile.
2. The ability on the Elf Theif “ zap to draw ...” can you zap it during an opponents turn.

1. How many cards in a player's hand is public info. Discard pile is public info.

2. Zap can be used on an opponent's turn, yes.

[MiB1213]

Originally Posted by HunterS

1. How many cards in a player's hand is public info. Discard pile is public info.

2. Zap can be used on an opponent's turn, yes.

Thank you.