Kreatur — Zombie, Zauberer
2 / 2
Wenn der Alchimist aus Sedraxis ins Spiel kommt, bringe eine bleibende Karte deiner Wahl, die kein Land ist, auf die Hand ihres Besitzers zurück, falls du eine blaue bleibende Karte kontrollierst.
The "intervening 'if' clause" means that (1) the ability won't trigger at all unless you control a permanent of the specified color, and (2) the ability will do nothing unless you control a permanent of the specified color at the time it resolves.
This ability isn't optional. When Sedraxis Alchemist enters, if you control a blue permanent and no other player controls a nonland permanent, you'll have to target a nonland permanent you control.