This is called the “legend rule.” Only one copy of a given legendary card may be in control by a same player at the same time. If multiple copies of a legend are under control by a same player, the player choose one of them, and all of the rest are put into the graveyard (discard pile).
Do copies trigger enter the battlefield?
An object that enters the battlefield “as a copy” or “that’s a copy” of another object becomes a copy as it enters the battlefield. It doesn’t enter the battlefield, and then become a copy of that permanent.
Can you copy a legendary sorcery?
A player can’t cast a legendary instant or sorcery spell unless that player controls a legendary creature or a legendary planeswalker. Note also that this only applies to casting. So if somehow you lose access to your legendary permanent between casting the spell and you copying it, the copying isn’t affected at all.
What happens if you have multiple copies of a legend?
If multiple copies of a legend are under control by a same player, the player choose one of them, and all of the rest are put into the graveyard (discard pile). (This has not always been the case; see History below.)
What do you do when acclaimed contender enters the battlefield?
When Acclaimed Contender enters the battlefield, if you control another Knight, look at the top five cards of your library. You may reveal a Knight, Aura, Equipment, or legendary artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
Do you have to have the same name on all the Legend cards?
The cards must have exactly the same name in order to trigger the legend rule. Some characters are represented on multiple cards: for example, the character Kamahl appears as both Kamahl, Pit Fighter and Kamahl, Fist of Krosa, and the character Akroma appears as both Akroma, Angel of Wrath and Akroma, Angel of Fury.
What happens when acquisitions expert enters the battlefield?
When Acquisitions Expert enters the battlefield, target opponent reveals a number of cards from their hand equal to the number of creatures in your party. You choose one of those cards. That player discards that card. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)
