cr:6.4.7b

The condition of a self-replacement effect is evaluated at the time the preceding effect is generated. If the condition is dependent on any undetermined parameters of the preceding effect, it is evaluated at the time those parameters are determined.

Example: Weave Earth has the text “The next Earth or Elemental attack action card you play this turn gets +3 {p}. If it’s fused, instead it gets +4{p}.” the latter of which is a self-replacement effect with a condition that is dependent on the parameters of a future card. When an Earth or Elemental attack action card is played later that turn, the parameter of whether it is fused is determined, the condition of the self-replacement effect is evaluated, and the self-replacement effect may be applied.