If a unit has deflect and is the target of a repeated spell, must you pay double the cost?

Yes, you must pay the Deflect cost for each time the spell chooses your unit.

According to Rule 735.1.c, the Deflect keyword functions as:

"Spells and abilities an opponent controls that choose me cost an amount of Power equal to [Deflect Value] more to play as an additional cost for each time they choose me."

Key Mechanics:

  • Per-Targeting Cost: Deflect is not a "once per spell" cost. If a spell (or a spell with the Repeat keyword) chooses a unit with Deflect multiple times, the Deflect cost must be paid for every individual instance of targeting.
  • Timing: These costs are mandatory additional costs that must be paid during the process of playing the card (Rule 353.2.a.2). If you are playing a spell with Repeat and choose to pay the Repeat cost, you are effectively choosing to execute the spell's instructions twice. If both of those executions target the same unit with Deflect, you must pay the Deflect cost twice.
  • Finalization: Because Deflect is an additional cost paid when the spell is played (finalized), you cannot retroactively apply it if a unit gains Deflect after the spell is already on the chain (see FAQ #1720).

Summary: If a spell targets your unit twice (whether through Repeat or multi-target effects like Icathian Rain), you must pay the Deflect cost twice.