Research // Development
Shuffle up to four cards you own from outside the game into your library.
Create a 3/1 red Elemental creature token unless any opponent has you draw a card. Repeat this process two more times.
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Reglas oficiales (11) · Scryfall
Development's effect is repeated three times no matter which option the opponent chooses. The opponent may choose a different option each time. You'll wind up with three Elemental tokens, two tokens and a card, one token and two cards, or three cards, whichever your opponent chooses.
In a multiplayer game, each opponent, in turn, has the option to let you draw a card. If no opponent does, you put a token onto the battlefield. Then the process repeats two more times. A different opponent may let you draw a card each time.
The exile zone is a part of the game, so you can't get exiled cards.
A card "from outside the game" may be a card from your collection or a card from your sideboard. In tournament play, you can't choose a card from your collection. The cards you choose don't all have to come from the same place.
A split card's characteristics are a combination of its two halves while it is not on the stack. For example, Assault // Battery has a mana value of 5 while it is in your library. If an effect allows you to search your library for a card with mana value 4 or less, you can't find Assault // Battery.
If an effect allows you to cast a spell with certain characteristics, consider only the characteristics of the half you're casting. For example, if an effect allows you to cast a sorcery spell with mana value 2 or less from among cards in your graveyard, you could cast Assault this way, but not Battery.
If you copy a spell that's half of a split card, the copy copies that same half. For example, if you copy Assault, the copy is also Assault, not Battery.
Split cards have two card faces on a single card. The characteristics of the half you didn't cast are ignored while the spell is on the stack.
Each split card has two names. If an effect instructs you to choose a card name, you may choose one of those names, but not both.
Each split card is a single card. For example, if you discard a split card, you've discarded one card, not two. If an effect counts the number of sorcery cards in your graveyard, Assault // Battery counts once, not twice.
To cast a split card, choose one of its halves to cast. There's no way to cast both halves of this split card.