Crystal phoenix has been my go to st heal for a long ass time and for some reason he keeps getting cheaper I feel.
Font Ignorance made it cheaper. Personally I think it was the right thing to do since some people would just throw it at the opponents font and contest for a turn or 2.
Pretty sure Phoenix didn't get a discount when Font Ignorance got added, but that happened so long ago I can't remember. This patch it got cheaper because the Default upgrade for the Divine Favor 1/2/3 upgrade line went to DF2 instead of DF3, that's all. (So it didn't REALLY get cheaper.)