Sedraxis Alchemist

Creature — Zombie Wizard

When Sedraxis Alchemist enters the battlefield, if you control a blue permanent, return target nonland permanent to its owner's hand.

2/2

2009-02-01:
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.
2009-02-01:
This ability isn’t optional. When Sedraxis Alchemist enters the battlefield, if you control a blue permanent and no other player controls a nonland permanent, you’ll have to target a nonland permanent you control.