Flow

When can I play a spell using Flow?Copy Anchor Link

You can play it from your trash only when you otherwise have permission to play it at that timing.

Flow lets you play the spell from your trash for its Flow cost.^[829.1.b] It changes no other permissions or timing restrictions.^[829.1.b.2] For example, Flow does not grant a spell Reaction or let you play an Action outside its normal timing.

Where does a spell played using Flow go if it is countered?Copy Anchor Link

It is banished unless another replacement effect changes that result.^[370.2][372]

An effect that says "Counter a spell" can target only a finalized spell on the chain.^{[355.10][355.9.a.2]} Countering clears the spell from the chain and would normally put it in the trash.^{[426.1.a][426.1.a.1]} However, playing a spell using Flow creates a delayed replacement effect that banishes it if it would leave the chain after becoming finalized, unless its own execution instructed it to leave.^[829.1.b.1] Countering, rather than the spell's own execution, makes it leave the chain, so the Flow replacement effect banishes it instead.

Which cost do effects use when they check a Flow spell's cost?Copy Anchor Link

Effects use the spell's printed or copied cost, not its Flow cost or the amount paid.^[206]

A Flow cost is an alternate cost that replaces the spell's base cost during finalization.^[829.1.c.1] For example, Defy can counter the spell if its printed or copied cost is no more than 4 and no more than , even when its Flow cost exceeds either limit.