Realms cannot be affected by spells or abilities controlled by an opponent. Players cannot draw cards
from an opponent's realm.
Whenever a player draws a card, that player can draw from any colored library they like. Or,
the player may draw from his or her realm library.
Decks can sometimes grow to thousands of cards. During a game I pull 30 cards for each color to use
during that game. Any tutors are limited to searching a single colored deck, not the 1000's stored in the big box.
Players can look at each card as they draw their opening hands.
Players keep their own separate graveyards.
The player that draws a card is considered that card's "owner".
Returning Cards to Libraries
Whenever a card is returned to a library, it returns to the library it came from. For instance, Time
Ebb returns green creature cards to top of the green library .
Choosing a library to draw from does not use the stack, so no one can respond to it. For instance,
you can’t Reclaim a crap card onto a library after a player has decided which one they will draw from.
Who Picks which Library
The controller of the spell or ability chooses one legal library it affects. See "your library" below.
For "mill costs" such as Dredge or Arc Slogger, the controlling player must choose a deck in his color identity.
Color Identity: "Your Library" and "His or her
A player's color identity is determined by the colors of mana produced
by his or her basic lands. For instance, a player who controls a forest and two islands has a blue green color identity.
"Your library" includes any library within your color identity. "His or her library" includes a library within that
player's color identity.
Revealing the Top Card of Libraries
If a card continuously reveals the top card of a library (such as Wizened Snitches), its controller
chooses which library that card affects when the card enters the battlefield.
Whenever a player searches a library, that player may only search one library. This includes scrying
and effects that allow a player to look at the top cards of a library, like Ponder.
In short, you can't deplete meaningless libraries with dredge, or Polymorph into a green
fatty unless you are playing green.
Multiple Players Searching a Single Library
If two or more players would simultaneously search the same library, the controller of the spell
or abilty searches the library first. Subsequent players search in turn order.
Check the researcher page for this optional mechanic. When players are drawing from huge decks,
a bit of looting can give them more control over their fate. The researcher is a planeswalker that starts the game on the
battlefield, giving players a limited ability to loot.
Artifacts and non-basic lands are allowed in decks. If a colorless card has a colored mana symbol
in its rule text, it is recommended that the card be included in the deck of that color.
Gold and Hybrid Cards
Hybrid cards are allowed in decks. However, gold cards are often difficult to cast in this format
and are not recommended. The exception to this is the "easy cast" gold cards like Slave of Bolas.
See the "Ideas" page for more details on gold, hybrid and colorless cards.