Rule 829.1.b

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

• 829.1.b.1 Banishing the spell in this way is a delayed replacement effect. If the spell would leave the chain after becoming a…
• 829.1.b.2 Playing a spell for its Flow cost does not change the timing at which it can be played, nor any permissions for the…

Official Core Rules