Builder Restrictions

These are the current Block Builder rules/limitations. They may change with future developments.

Card Jail
An informal term created in the Discord used to refer to cards that function properly and don't break any rules outlined in the Submission Rules and Guidelines, but are still not allowed by the developers. The general rule is that "if your card works, then post it." However, there may be exceptions if they are harmful to the game or likely to cause bugs.

The current list of effects which will land a card in "card jail":
 * Cards which interact directly with a hero's abilities, such as buffing Cassiel.
 * Cards with multiple tribal types. Multi-tribes might never be implemented.
 * Cards that reference traveling back in time. This is due to official lore reasons.

Card Limbo
An informal term used to refer to cards which have been created and voted into the game, but are not in the game, due to a bug or incomplete feature. A card will temporarily sit in Limbo while its underlying bug or required feature is fixed.

Outdated Limitations

 * Triggered abilities where you make decisions, outside of resolving (no "when a unit attacks, deal 1 damage to an enemy unit”).
 * This is now possible with the Choose One Card and Choose Cards steps.


 * “When gain stats/player hp” triggers (no "whenever you gain life, draw a card").
 * This is now possible with the When property value changes... step.


 * Effects that make copies of a saved group of cards (no "make a copy of each card that has been removed from game by this card").
 * This is now possible with the Group: Do Something for Each Item... step.

Current Limitations

 * Manually triggering “hook” abilities such as Summon or Entomb (no "your units Summon abilities happen twice").
 * Replacement/instead effects (no "the first time you would take damage this turn, prevent it").
 * Change of control effects (no "gain control of a unit").
 * "When lose ability” triggers (no "when a unit loses Ward, it gains Ward").
 * Effects that refer to events happening before a certain card is created/drafted (for specific situations where a card haven't existed since the start of a game: no "if a unit died last turn, this gets +1/+1")