Flow

Flow is a passive ability keyword present on Spells.

It is functionally short for "You may play this from your trash for its flow cost. Then banish it."

Banishing the spell in this way is a delayed replacement effect. If the spell would leave the chain after becoming a finalized chain item, and leaving the chain wasn't instructed by its own execution, banish it instead.

Playing a spell for its Flow cost does not change the timing at which it can be played, nor any permissions the spell has aside from the zone from which it can be played.

It is formatted as "Flow [Cost]". The cost is an alternate cost that replaces the base cost of the spell to be paid during finalization.

Flow costs may include both resource costs and non-resource costs.

If a spell has multiple instances of the Flow keyword with different costs, its controller may choose which cost to apply as they play it.